Kingston For Mac Ram

To identify your MacBook Pro model, use the information in How to identify MacBook Pro models.

Kingston For Mac Ram Upgrade
Kingston Mac Ram

Works on my MacBook Pro md101 Mid 2012 model along with one slot containing 2GB Ram. Now my MacBook has 8gb(kingston) new ram + 2gb in built ram (old) total 10GB Ram. The speed has certainly improved and apps now open faster and work smoothly. Have been using it since last 4 months, no issues. A good upgrade without much hassle and cost. Kingston 512MB (2 x 256MB) DDR 400 (PC 3200) Dual Channel Kit Memory for Apple Desktop Model KTA-G5400/512. Type: 184-Pin DDR SDRAM Compatibility: Apple: iMac G5 1.6GHz / 1.8GHz, iMac G5 2GHz, Power Mac G5 1.8GHz (Late 2004), Power Mac G5 1.8GHz / Dual 1.8GHz/2GHz, Power Mac G5 Dual 1.8GHz (June 2004), Power Mac G5 Dual 2.3GHz (Early 2005), Power Mac G5 Dual 2.5GHz (June 2004), Power Mac. Installed memory (RAM) is displayed under the System section.-Windows 7 Click on the Start button and right-click Computer. Select Properties to display System. Installed memory (RAM) is displayed under the System section.-MacOS X: Select 'About This Mac' or 'About This Computer' from the Apple menu in the upper left corner of your Desktop. Imac Ram Upgrade & Mac Memory Upgrade If you order before 3pm, we almost always get your ram dispatched the same day. We offer two delivery options (Australia Post and Courier). If you need your iMac ram upgrade fast, go the courier option for only a few dollars more! If you need a hand finding the right ram for your mac, you can ask us on live.

Once you're sure which model you have, find it in the list below to go to the instructions for that model. Download mac os for asus. Note: Apple notebooks not listed in this table have non-removable memory.

13-inch

MacBook Pro (13-inch, Mid 2012)
MacBook Pro (13-inch, Late 2011)
MacBook Pro (13-inch, Early 2011)
MacBook Pro (13-inch, Mid 2010)
MacBook Pro (13-inch, Mid 2009)

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15-inch

MacBook Pro (15-inch, Mid 2012)
MacBook Pro (15-inch, Late 2011)
MacBook Pro (15-inch, Early 2011)
MacBook Pro (15-inch, Mid 2010)
MacBook Pro (15-inch, 2.53GHz, Mid 2009)
MacBook Pro (15-inch, Mid 2009)
MacBook Pro (15-inch, Late 2008)
MacBook Pro (15-inch, Early 2008) and earlier

17-inch

MacBook Pro (17-inch, Late 2011)
MacBook Pro (17-inch, Early 2011)
MacBook Pro (17-inch, Mid 2010)
MacBook Pro (17-inch, Mid 2009)
MacBook Pro (17-inch, Early 2009)
MacBook Pro (17-inch, Late 2008) and earlier

Applicable Models

The instructions provided below are for the following MacBook Pro (13-inch) models:

MacBook Pro (13-inch, Mid 2012)
MacBook Pro (13-inch, Late 2011)
MacBook Pro (13-inch, Early 2011)
MacBook Pro (13-inch, Mid 2010)
MacBook Pro (13-inch, Mid 2009)

Memory specifications

Use the tables below to confirm the memory you're installing is compatible with your MacBook Pro.

MacBook Pro (13-inch, mid 2012)
Number of memory slots	2
Base memory	4 GB
Maximum memory	8 GB
Memory card specifications	- Double Data Rate Small Outline Dual Inline Memory Module (DDR3) format - 67.6mm x 30mm (1.18 inch) - 2 GB or 4 GB - 204-pin - PC3-12800 DDR3 1600 MHz type RAM
Additional notes	For best performance, fill both memory slots, installing an equal memory module in each slot.

MacBook Pro (13-inch, Late 2011) and MacBook Pro (13-inch, Early 2011)
Number of memory slots	2
Base memory	4 GB
Maximum memory	8 GB
Memory card specifications	- Double Data Rate Small Outline Dual Inline Memory Module (DDR3) format - 67.6mm x 30mm (1.18 inch) - 2 GB or 4 GB - 204-pin - PC3-10600 DDR3 1333 MHz type RAM
Additional notes	For best performance, fill both memory slots, installing an equal memory module in each slot.

MacBook Pro (13-inch, Mid 2010) and MacBook Pro (13-inch, Mid 2009)
Number of memory slots	2
Base memory	4 GB
Maximum memory	8 GB
Memory card specifications	- Double Data Rate Small Outline Dual Inline Memory Module (DDR3) format -30mm (1.18 inch) - 2 GB or 4 GB - 204-pin - PC3-8500 DDR3 1066 MHz type RAM
Additional notes	For best performance, fill both memory slots, installing an equal memory module in each slot.

Removing or installing memory

Warning: The internal components of your MacBook Pro can be warm. If you have been using your MacBook Pro, wait ten minutes after shutting down the computer to let the internal components cool before continuing.

Step 1: Remove the bottom case

Shut down your MacBook Pro. Disconnect the power adapter, Ethernet cable, USB cables, security lock, and any other cables connected to the MacBook Pro to prevent damaging the computer.
Turn over your MacBook Pro and remove the ten (10) screws that secure the bottom case. Because the screws are different lengths, note the screw lengths and locations so you can replace the screws correctly. Put them aside in a safe place. Lift off the case and place it to the side.
Touch a metal surface inside the computer to discharge any static electricity from your body.

Step 2: Remove existing memory (if present)

Push the levers on the sides of the memory module in an outward direction to release the module from the memory card slot. The memory pops up at an angle. Before removing it, make sure you find the half-circle notches. If you don’t, try pressing the levers outward again.
Hold the memory module by its notches and remove it from the slot.
Remove the other memory module.
Important: Hold the memory modules by their edges, and do not touch the gold connectors.

Step 3: Install memory

Align the notch on the gold edge of the module with the notch in the lower memory slot.
Tilt the card and push the memory into the slot.
Use two fingers with firm, even pressure to push down on the memory module. There should be a click when you insert the memory correctly.
Repeat this procedure to install an additional memory module in the top slot. Press down on the module to make sure it is level.
Note: Make sure you install the memory according to this illustration, with the gold contacts inserted almost completely into the connector.

Step 4: Replace the bottom case

Replace the bottom case. Replace and tighten the ten screws you removed earlier, making sure to put the different length screws in their proper locations.

Applicable Models

The instructions provided below are for the following MacBook Pro 15-inch models:

MacBook Pro (15-inch, Mid 2012)
MacBook Pro (15-inch, Late 2011)
MacBook Pro (15-inch, Early 2011)
MacBook Pro (15-inch, Mid 2010)
MacBook Pro (15-inch, 2.53GHz Mid 2009)
MacBook Pro (15-inch, Mid 2009)

Memory specifications

Please use the tables below to confirm the memory being installed is compatible with your MacBook Pro.

MacBook Pro (15-inch, Mid 2012)
Number of memory slots	2
Base memory	4 GB
Maximum memory	8 GB
Memory card specifications	- Double Data Rate Small Outline Dual Inline Memory Module (DDR3) format - 30mm (1.18 inch) - 2 GB or 4 GB - 204-pin - PC3-12800 DDR3 1600 MHz type RAM
Additional notes	For best performance, fill both memory slots, installing an equal memory module in each slot.

MacBook Pro (15-inch, Late 2011) and MacBook Pro (15-inch, Early 2011)
Number of memory slots	2
Base memory	4 GB
Maximum memory	8 GB
Memory card specifications	- Double Data Rate Small Outline Dual Inline Memory Module (DDR3) format - 30mm (1.18 inch) - 2 GB or 4 GB - 204-pin - PC3-10600 DDR3 1333 MHz type RAM
Additional notes	For best performance, fill both memory slots, installing an equal memory module in each slot.

MacBook Pro (15-inch, Mid 2010), MacBook Pro (15-inch, 2.53GHz Mid 2009), MacBook Pro (15-inch, Mid 2009)
Number of memory slots	2
Base memory	4 GB
Maximum memory	8 GB
Memory card specifications	- Double Data Rate Small Outline Dual Inline Memory Module (DDR3) format - 30mm (1.18 inch) - 2 GB or 4 GB - 204-pin - PC3-8500 DDR3 1066 MHz type RAM
Additional notes	For best performance, fill both memory slots, installing an equal memory module in each slot.

Removing or installing memory

Step 1: Remove the bottom case

Shut down your MacBook Pro. Disconnect the power adapter, Ethernet cable, USB cables, security lock, and any other cables connected to the MacBook Pro to prevent damaging the computer.
Turn over your MacBook Pro and remove the ten (10) screws that secure the bottom case. Because the screws are different lengths, note the screw lengths and locations so you can replace the screws correctly. Put them aside in a safe place. Lift off the case and place it to the side.
Touch a metal surface inside the computer to discharge any static electricity from your body.

Step 2: Remove existing memory (if present)

Push the levers on the sides of the memory module in an outward direction to release the module from the memory card slot. The memory pops up at an angle. Before removing it, make sure you find the half-circle notches. If you don’t, try pressing the levers outward again.
Hold the memory module by its notches and remove it from the slot.
Remove the other memory module.
Important: Hold the memory modules by their edges, and do not touch the gold connectors.

Step 3: Install memory

Align the notch on the gold edge of the module with the notch in the lower memory slot.
Tilt the card and push the memory into the slot.
Use two fingers with firm, even pressure to push down on the memory module. There should be a click when you insert the memory correctly.
Repeat this procedure to install an additional memory module in the top slot. Press down on the module to make sure it is level.Note: Make sure you install the memory according to this illustration, with the gold contacts inserted almost completely into the connector.

Step 4: Replace the bottom case

Replace and tighten the ten screws you removed earlier, making sure to put the different length screws in their proper locations.

Applicable model

The instructions provided below are for the following MacBook Pro 15-inch models:

MacBook Pro (15-inch, Late 2008)

Memory specifications

Please use the table below to confirm the memory being installed is compatible with your MacBook Pro.

MacBook Pro (15-inch, late 2008)
Number of memory slots	2
Base memory	2 GB
Maximum memory	4 GB
Memory card specifications	- Double Data Rate Small Outline Dual Inline Memory Module (DDR3) format - 30mm (1.18 inch) - 1 GB or 2 GB - 204-pin - PC3-8500 DDR3 1066 MHz type RAM
Additional notes	For best performance, fill both memory slots and install an identical memory module in each slot.

Removing or installing memory

Step 1: Remove the access door

Shut down your MacBook Pro. Disconnect the power adapter, Ethernet cable, security lock, and any other cords connected to the MacBook Pro to prevent damaging the computer.
Turn over your MacBook Pro and locate the latch. Push down to release the latch and remove the access door that covers the battery and hard drive.
The latch must be in its released, open position to remove the access door.

Step 2: Remove the battery

With the latch still in its open position, gently pull up on the tab to remove the battery.

Step 3: Remove the bottom case

Remove the eight screws that secure the bottom case of your MacBook Pro, and then remove the bottom case.
Important: Because the screws are different lengths, note the screw lengths and locations so you can replace the screws correctly. Put them aside in a safe place.
Touch a metal surface inside the computer to discharge any static electricity from your body.

Step 4: Remove existing memory (if present)

Push out the ejection levers on the sides of the memory module to release the module from the memory card slot. The memory pops up at an angle. Before removing it, make sure you find the half-circle notches. If you don’t, try pressing the ejection levers again.
Hold the memory module by the notches and remove it from the slot.
Remove the other memory module.
Important: Hold the memory modules by their edges; do not touch the gold connectors.

Step 5: Install memory

Align the notch on the gold edge of the module with the notch in the lower memory slot.
Tilt the card and push the memory into the slot.
Use two fingers with firm, even pressure to push down on the memory module. There should be a click when you insert the memory correctly.
Repeat, if necessary, to install an additional memory module in the top slot. Press down on the module to make sure it is level.
Note: Make sure you install the memory according to the illustration below, with the gold contacts inserted almost completely into the connector.

Step 6: Replace the bottom case

Replace the bottom case. Replace and tighten the eight screws.

Step 7: Replace the battery

To replace the battery, make sure the latch is in its open position. Hold the battery at an angle and slide the lipped edge of the battery below the brackets on the outside edge of the battery bay. Gently press the battery down.

Step 8: Replace the access door

With the latch in the open position replace the access door, making sure it is level with the bottom case of your MacBook Pro, and press the latch into the closed position.

Applicable models

The instructions provided below are for the following MacBook Pro 17-inch models:

MacBook Pro (17-inch, Late 2011)
MacBook Pro (17-inch, Early 2011)
MacBook Pro (17-inch, Mid 2010)
MacBook Pro (17-inch, Mid 2009)
MacBook Pro (17-inch, Early 2009)

Memory specifications

Use the tables below to confirm the memory being installed is compatible with your MacBook Pro.

MacBook Pro (17-inch, Late 2011) and MacBook Pro (17-inch, Early 2011)
Number of memory slots	2
Base memory	4 GB
Maximum memory	8 GB
Memory card specifications	- Double Data Rate Small Outline Dual Inline Memory Module (DDR3) format - 67.6mm x 30mm (1.18 inch) - 2 GB or 4 GB - 204-pin - PC3-10600 DDR3 1333 MHz type RAM
Additional notes	You can add two 4 GB memory modules for a maximum of 8 GB of memory. For best performance, fill both memory slots and install an identical memory module in each slot.

MacBook Pro (17-inch, Mid 2010), MacBook Pro (17-inch, Mid 2009), and MacBook Pro (17-inch, Early 2009)
Number of memory slots	2
Base memory	4 GB
Maximum memory	8 GB
Memory card specifications	- Double Data Rate Small Outline Dual Inline Memory Module (DDR3) format - 30mm (1.18 inch) - 2 GB or 4 GB - 204-pin - PC3-8500 DDR3 1066 MHz type RAM
Additional notes	You can add two 4 GB memory modules for a maximum of 8 GB of memory. For best performance, fill both memory slots and install an identical memory module in each slot.

Removing or installing memory

Step 1: Remove the bottom case

Shut down your MacBook Pro. Disconnect the power adapter, Ethernet cable, USB cables, security lock, and any other cables connected to the MacBook Pro to prevent damaging the computer.
Turn over your MacBook Pro and remove the ten (10) screws that secure the bottom case. Because the screws are different lengths, note the screw lengths and locations so you can replace the screws correctly. Put them aside in a safe place. Lift off the case and place it to the side.
Touch a metal surface inside the computer to discharge any static electricity from your body.

Step 2: Remove existing memory (if present)

Push the levers on the sides of the memory module in an outward direction to release the module from the memory card slot. The memory pops up at an angle. Before removing it, make sure you find the half-circle notches. If you can't find the notches, try pressing the levers outward again.
Hold the memory module by its notches and remove it from the slot.
Remove the other memory module.
Important: Hold the memory modules by their edges; do not touch the gold connectors.

Step 3: Install memory

Align the notch on the gold edge of the module with the notch in the lower memory slot.
Tilt the card and push the memory into the slot.
Use two fingers with firm, even pressure to push down on the memory module. There should be a click when you insert the memory correctly.
Repeat this procedure to install an additional memory module in the top slot. Press down on the module to make sure it is level.
Note: Make sure your memory is installed according to the illustration below, with the gold contacts inserted almost completely into the connector.

Step 4: Replace the bottom case

Replace the bottom case. Replace and tighten the ten screws you removed earlier, making sure to put the different length screws in their proper locations.

Applicable models

The instructions provided below are for the following MacBook Pro 15-inch and 17-inch models:

MacBook Pro (17-inch, Late 2008) and earlier
MacBook Pro (15-inch, Early 2008) and earlier

Memory specifications

Please use the tables below to confirm the memory being installed is compatible with your MacBook Pro.

MacBook Pro (17-inch, Late 2008) and earlier and MacBook Pro (15-inch, Early 2008) and earlier
Number of memory slots	2
Base memory	512 MB (configure to order)
Maximum memory	Refer to the table below
Memory card specifications	- Double Data Rate Small Outline Dual Inline Memory Module (DDR3) format - 30mm (1.18 inch) - 200-pin - PC2-5300 DDR2 667 MHz Type RAM

Refer to this table for the maximum amount of memory that can be recognized by these notebook computers:

2 GB	MacBook Pro, MacBook Pro (17-inch), MacBook Pro (15-inch, Glossy)
3 GB	MacBook Pro (15-inch and 17-inch Core 2 Duo) Note: These models will support only 3 GB total memory. If you want to maximize the amount of SDRAM in your computer, install a 2 GB SO-DIMM in one slot and a 1GB SO-DIMM in the other.
4 GB	MacBook Pro (15-inch 2.4/2.2 GHz), MacBook Pro (17-inch 2.4 GHz), MacBook Pro (15-inch Early 2008), MacBook Pro (17-inch Late 2008)

Removing or installing memory

You will need to remove the battery before installing additional memory and reinstall the battery after installing the memory. The following procedure includes all the necessary instructions for both parts of the process.

Step 1: Remove the battery

Shut down your MacBook Pro. Disconnect the power adapter, Ethernet cable, and any other cords connected to the MacBook Pro to prevent damaging the computer.
Turn the computer over.
Locate the battery release latches on each side of the battery.
Slide both latches up. The battery should pop up slightly.
Lift the battery out.

Step 2: Remove the memory door

Using a Phillips size 00 screwdriver, unscrew the memory door and remove it from the battery bay of your computer. Depending on the model of your MacBook Pro, you may have three or four screws.
Touch a metal surface inside the computer to discharge any static electricity from your body.

Step 3: Remove existing memory (if present)

If you need to remove a memory card—for example if you are replacing it or if you need to get past the memory in the top slot to access the bottom slot—you can remove the card by spreading the tabs on each side of the card away from the notches in the memory card. The card should pop up slightly. Lift the memory card to about a 25-degree angle and then gently slide the card out of the memory slot.
Important: Hold the memory modules by their edges; do not touch the gold connectors.

Step 4: Install memory

Insert the new memory card at a 25-degree angle. Line up the notch in the card with the small tab in the memory slot and slide the card into the slot until the gold edge is almost invisible. Firmly press the memory card into the memory slot. You might feel some resistance.
Gently spread the small tabs in the memory slot away from the notches and push the memory card down until the two tabs on either side of the card lock into place.
Insert any additional memory into the second slot.
Note: Make sure you install the memory according to the illustration below, with the gold contacts inserted almost completely into the connector.

Step 5: Replace the memory door

Replace the memory door, and make sure the door is lying flat before you screw it back into place.

Step 6: To insert the battery

Place the bottom edge of the battery into the battery compartment at an angle, as shown below.
Gently press the top edge of the battery down until the battery latch locks into place.

Learn more

Checking that your computer recognizes the new memory

After installing additional memory, you should confirm that the computer recognizes the new memory. To check the computer’s memory:

Start up your computer.
When you see the Mac OS X desktop, choose the Apple () menu from the upper-left menu bar, then choose About This Mac.

The total memory includes the amount of memory that originally came with the computer plus the new memory you added, or if all the memory has been replaced, the new total for that memory. For detailed information about the amount of memory installed in your computer, open System Profiler by choosing Apple () and then About This Mac. Then, click More Info and then Memory from the Hardware section that appears in System Profiler.

If your computer doesn’t recognize the memory or doesn’t start up correctly, confirm that the memory you installed is compatible with your MacBook Pro and that it is installed correctly by reseating the memory.

Choose your iMac model

If you're not sure which iMac you have, you can identify your iMac and then select it from the list below.

27-inch

24-inch

21.5-inch

iMac (Retina 4K, 21.5-inch, 2019)*
iMac (Retina 4K, 21.5-inch, 2017)*
iMac (21.5-inch, 2017)*
iMac (21.5 inch, Mid 2014)*
iMac (21.5-inch, Late 2013)*
iMac (21.5-inch, Late 2012)*

20-inch

17-inch

* Memory is not removable by users on iMac (21.5-inch, Late 2012), iMac (21.5-inch, Late 2013), iMac (21.5-inch, Mid 2014), iMac (21.5-inch, 2017), iMac (Retina 4K, 21.5-inch, 2017), and iMac (Retina 4K, 21.5-inch, 2019). If the memory in one of these computers needs repair service, contact an Apple Retail Store or Apple Authorized Service Provider. If you’d like to upgrade the memory in one of these models, an Apple Authorized Service Provider can help. Before you schedule an appointment, confirm that the specific Apple Authorized Service Provider offers memory upgrade services.

Memory in iMac (21.5-inch, Late 2015), and iMac (Retina 4K, 21.5-inch, Late 2015) is not upgradeable.

iMac (Retina 5K, 27-inch, 2020)

Get memory specifications for iMac (Retina 5K, 27-inch, 2020), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots	4
Base memory	8GB (2 x 4GB DIMMs)
Maximum memory	128GB (4 x 32GB DIMMs)

For optimal memory performance, DIMMs should be the same capacity, speed, and vendor. Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

PC4-21333
Unbuffered
Nonparity
260-pin
2666MHz DDR4 SDRAM

If you have mixed capacity DIMMs, see the install memory section for installation recommendations.

iMac (Retina 5K, 27-inch, 2019)

Get memory specifications for iMac (Retina 5K, 27-inch, 2019), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots	4
Base memory	8GB (2 x 4GB DIMMs)
Maximum memory	64GB (4 x 16GB DIMMs)

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

PC4-21333
Unbuffered
Nonparity
260-pin
2666MHz DDR4 SDRAM

iMac (Retina 5K, 27-inch, 2017)

Get memory specifications for iMac (Retina 5K, 27-inch, 2017), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Kingston For Mac Ram Upgrade

Number of memory slots	4
Base memory	8GB (2 x 4GB DIMMs)
Maximum memory	64GB (4 x 16GB DIMMs)

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

PC4-2400 (19200)
Unbuffered
Nonparity
260-pin
2400MHz DDR4 SDRAM

iMac (Retina 5K, 27-inch, Late 2015)

Get memory specifications for iMac (Retina 5K, 27-inch, Late 2015), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots	4
Base memory	8GB
Maximum memory	32GB

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

PC3-14900
Unbuffered
Nonparity
204-pin
1867MHz DDR3 SDRAM

For these 27-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

iMac (Retina 5K, 27-inch, Mid 2015)
iMac (Retina 5K, 27-inch, Late 2014)
iMac (27-inch, Late 2013)
iMac (27-inch, Late 2012)

Memory specifications

Kingston Mac Ram

These iMac models feature Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots	4
Base memory	8GB
Maximum memory	32GB

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

PC3-12800
Unbuffered
Nonparity
204-pin
1600MHz DDR3 SDRAM

Installing memory

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After you shut down your iMac and give it time to cool, follow these steps:

Disconnect the power cord and all other cables from your computer.
Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
Open the memory compartment door by pressing the small grey button located just above the AC power port:
The memory compartment door will open as the button is pushed in. Remove the compartment door and set it aside:
A diagram on the underside of the compartment door shows the memory cage levers and the orientation of the DIMM. Locate the two levers on the right and left sides of the memory cage. Push the two levers outward to release the memory cage:
After the memory cage is released, pull the memory cage levers toward you, allowing access to each DIMM slot.
Remove a DIMM by pulling the module straight up and out. Note the location of the notch on the bottom of the DIMM. When reinstalling DIMMs, the notch must be oriented correctly or the DIMM won't fully insert:
Replace or install a DIMM by setting it down into the slot and pressing firmly until you feel the DIMM click into the slot. When you insert a DIMM, make sure to align the notch on the DIMM to the DIMM slot. Find your model below for specific installation instructions and notch locations:
- iMac (Retina 5K, 27-inch, 2020) DIMMs have a notch on the bottom, slightly left of the middle. If your DIMMs are mixed in capacity, minimize the capacity difference between Channel A (slots 1 and 2) and Channel B (slots 3 and 4) when possible.
- iMac (Retina 5K, 27-inch, 2019) DIMMs have a notch on the bottom, slightly left of the middle:
- iMac (27-inch, Late 2012) and iMac (Retina 5K, 27-inch, 2017) DIMMs have a notch on the bottom left:
- iMac (27-inch, Late 2013) and iMac (Retina 5K, 27-inch, Late 2014, Mid 2015, and Late 2015) DIMMs have a notch on the bottom right:
After you install all of your DIMMs, push both memory cage levers back into the housing until they lock into place:
Replace the memory compartment door. You don't need to press the compartment door release button when replacing the compartment door.
Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

Your iMac performs a memory initialization procedure when you first turn it on after upgrading memory or rearranging DIMMs. This process can take 30 seconds or more, and the display of your iMac remains dark until it's finished. Make sure to let the memory initialization complete.

For these 27-inch and 21.5-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

iMac (27-inch, Mid 2011)
iMac (21.5-inch, Mid 2011)
iMac (27-inch, Mid 2010)
iMac (21.5-inch, Mid 2010)
iMac (27-inch, Late 2009)
iMac (21.5-inch, Late 2009)

Memory specifications

Number of memory slots	4
Base memory	4GB (but is configured to order)
Maximum memory	16GB For iMac (Late 2009), you can use 2GB or 4GB RAM SO-DIMMs of 1066MHz DDR3 SDRAM in each slot. For iMac (Mid 2010) and iMac (Mid 2011), use 2GB or 4GB RAM SO-DIMMs of 1333MHz DDR3 SDRAM in each slot.

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

iMac (Mid 2011)	iMac (Mid 2010)	iMac (Late 2009)
PC3-10600	PC3-10600	PC3-8500
Unbuffered	Unbuffered	Unbuffered
Nonparity	Nonparity	Nonparity
204-pin	204-pin	204-pin
1333MHz DDR3 SDRAM	1333MHz DDR3 SDRAM	1066MHz DDR3 SDRAM

i5 and i7 Quad Core iMac computers come with both top memory slots populated. These computers will not start up if only a single DIMM is installed in any bottom slot; these computers should operate normally with a single DIMM installed in any top slot.

Core Duo iMac computers should operate normally with a single DIMM installed in any slot, top or bottom. ('Top' and 'bottom' slots refer to the orientation of the slots in the pictures below. 'Top' refers to the slots closest to the display; 'bottom' refers to the slots closest to the stand.)

Installing memory

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After you shut down your iMac and give it time to cool, follow these steps:

Disconnect the power cord and all other cables from your computer.
Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
Using a Philips screwdriver, remove the RAM access door in the bottom of your computer:
Remove the access door and set it aside.
Untuck the tab in the memory compartment. If you're replacing a memory module, gently pull the tab to eject any installed memory module:
Insert your new or replacement SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown below.
After you insert it, press the DIMM up into the slot. There should be a slight click when you seat the memory correctly:
Tuck the tabs above the memory DIMMs, and reinstall the memory access door:
Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

For these 24-inch and 20-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

iMac (24-inch, Early 2009)
iMac (20-inch, Early 2009)
iMac (24-inch, Early 2008)
iMac (20-inch, Early 2008)
iMac (24-inch Mid 2007)
iMac (20-inch, Mid 2007)

Memory specifications

These iMac computers have two side-by-side Synchronous Dynamic Random-Access Memory (SDRAM) slots in the bottom of the computer.

The maximum amount of random-access memory (RAM) you can install in each computer is:

Computer	Memory Type	Maximum Memory
iMac (Mid 2007)	DDR2	4GB (2x2GB)
iMac (Early 2008)	DDR2	4GB (2x2GB)
iMac (Early 2009)	DDR3	8GB (2x4GB)

You can use a 1GB or 2GB RAM module in each slot for iMac (Mid 2007) and iMac (Early 2008). Use 1GB, 2GB, or 4GB modules in each slot for the iMac (Early 2009).

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

iMac (Mid 2007)	iMac (Early 2008)	iMac (Early 2009)
PC2-5300	PC2-6400	PC3-8500
Unbuffered	Unbuffered	Unbuffered
Nonparity	Nonparity	Nonparity
200-pin	200-pin	204-pin
667MHz DDR2 SDRAM	800MHz DDR2 SDRAM	1066MHz DDR3 SDRAM

DIMMs with any of the following features aren't supported:

Registers or buffers
PLLs
Error-correcting code (ECC)
Parity
Extended data out (EDO) RAM

Installing memory

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After your iMac cools down, follow these steps:

Disconnect the power cord and all other cables from your computer.
Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
Using a Philips screwdriver, remove the RAM access door in the bottom of the computer:
Remove the access door and set it aside.
Untuck the tab in the memory compartment. If you're replacing a memory module, untuck the tab and pull it to eject any installed memory module:
Insert your new or replacement RAM SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown above.
After you insert it, press the DIMM up into the slot. There should be a slight click when you seat the memory correctly.
Tuck the tabs above the memory DIMMs, and reinstall the memory access door:
Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

For these 20-inch and 17-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

iMac (20-inch Late 2006)
iMac (17-inch, Late 2006 CD)
iMac (17-inch, Late 2006)
iMac (17-inch, Mid 2006)
iMac (20-inch, Early 2006)
iMac (17-inch, Early 2006)

Memory specifications

Number of memory slots	2
Base memory	1GB	Two 512MB DIMMs; one in each of the memory slots	iMac (Late 2006)
	512MB	One DDR2 SDRAM installed into the top slot	iMac (17-inch Late 2006 CD)
	512MB	Two 256MB DIMMs; one in each of the memory slots	iMac (Mid 2006)
	512MB	One DDR2 SDRAM installed into the top slot	iMac (Early 2006)
Maximum memory	4GB	2 GB SO-DIMM in each of the two slots*	iMac (Late 2006)
Maximum memory	2GB	1GB SO-DIMM in each of the two slots	iMac (17-inch Late 2006 CD) iMac (Early 2006)
Memory card specifications	Compatible: - Small Outline Dual Inline Memory Module (DDR SO-DIMM) format - PC2-5300 - Nonparity - 200-pin - 667 MHz - DDR3 SDRAM		Not compatible: - Registers or buffers - PLLs - ECC - Parity - EDO RAM

For best performance, fill both memory slots, installing an equal memory module in each slot.
*iMac (Late 2006) uses a maximum of 3 GB of RAM.

Installing memory in the bottom slot

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After you shut down your iMac and give it time to cool, follow these steps:

Disconnect the power cord and all other cables from your computer.
Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac and set it aside:
Move the DIMM ejector clips to their fully open position:
Insert your RAM SO-DIMM into the bottom slot, keeping in mind the orientation of the keyed SO-DIMM:
After you insert it, press the DIMM up into the slot with your thumbs. Don't use the DIMM ejector clips to push in the DIMM, as this might damage the SDRAM DIMM. There should be a slight click when you seat the memory fully.
Close the ejector clips:
Reinstall the memory access door:
Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

Replacing memory in the top slot

After you shut down your iMac and give it time to cool, follow these steps:

Disconnect the power cord and all other cables from your computer.
Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac and set it aside:
Pull the two levers on each side of the memory compartment to eject the memory module that's already installed:
Remove the memory module from your iMac as shown below:
Insert your RAM SO-DIMM into the top slot, noting the orientation of the keyed SO-DIMM:
After you insert it, press the DIMM up into the slot with your thumbs. Don't use the DIMM ejector clips to push in the DIMM, as this might damage the SDRAM DIMM. There should be a slight click when you seat the memory fully.
Close the ejector clips:
Reinstall the memory access door:
Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

If your iMac makes a tone after you install memory

iMac models introduced before 2017 might make a warning sound when you start up after installing or replacing memory:

One tone, repeating every five seconds signals that no RAM is installed.
Three successive tones, then a five-second pause (repeating) signals that RAM doesn't pass a data integrity check.

If you hear these tones, confirm that the memory you installed is compatible with your iMac and that it's installed correctly by reseating the memory. If your Mac continues to make the tone, contact Apple Support.

Confirm that your iMac recognizes its new memory

After you install memory, you should confirm that your iMac recognizes the new RAM by choosing Apple () menu > About This Mac.

The window that appears lists the total memory, including the amount of memory that originally came with the computer plus the newly added memory. If all the memory in the iMac has been replaced, it lists the new total of all installed RAM.

For detailed information about the memory installed in your iMac, click System Report. Then choose Memory under the Hardware section in the left side of System Information.

If your computer doesn't recognize the memory or doesn't start up correctly, confirm that the RAM you installed is compatible with your iMac and that it's installed correctly by reseating the memory. If you continue to have issues with the memory in your iMac, contact Apple Support.