Dimm For Mac Pro

Your Mac Pro (Late 2013) has four upgradeable memory slots. These support up to 64GB of memory when all four slots are full using 1866 MHz DDR3 ECC RDIMMs.

1. Dimm For Mac
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3. Macbook Pro

Before upgrading memory

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Make sure that the memory you plan to use is compatible with your computer. The Mac Pro supports both unbuffered UDIMMs and registered RDIMMs, but it is important not to mix these types of memory. DIMMs that are not properly installed or do not meet the system requirements may effect system performance or not be recognized.

Apple recommends that you use Apple-approved DIMMs. You shouldn't use DIMMs from older Mac Pro computers in your new Mac Pro. You can purchase Apple-branded memory by visiting an Apple Retail store or Apple Authorized Reseller.

Refer to Mac Pro (Late 2013): Memory specifications for additional information.

Removing and installing memory

Part 1: Remove the enclosure

1. Before you open your Mac Pro, shut it down by choosing Shut Down from the Apple () menu.
2. If the computer is warm to the touch, wait approximately 5-10 minutes for the computer to cool down.
3. Touch the metal enclosure on the outside of the Mac Pro to discharge any static electricity.

   Important: Always discharge static before you touch parts or install components inside your Mac Pro. To avoid generating static, don't move around the room until you finish installing the memory and slide the enclosure back onto the computer.

4. Unplug all the cables and the power cord from your Mac Pro. Do not attempt to install memory while it's plugged in.
5. Slide the enclosure latch to the right to unlock the enclosure.
6. Lift the enclosure straight up and off of the computer. Carefully set it aside.
7. The DIMM slots are now visible from the left and right side of the I/O panel.

Part 2: Removing existing DIMMs

Your Mac Pro shipped with DIMMs already installed in some or all of the DIMM slots. Before upgrading the memory, you may need to remove some or all of the DIMMs. Refer to the table below to determine how your Mac Pro is configured and to determine which DIMMs you need to remove and replace to maintain a recommended memory configuration. See the numbered steps following the table to locate specific DIMM slots.

Important: All DIMMs are 1866MHz DDR3 ECC. Do not mix UDIMMs and RDIMMs.

Remove DIMMs with these steps.

1. There are a total of four DIMM slots. Two are located to the left and two are located to the right of the Mac Pro I/O panel.
2. Access the DIMM slots via the RAM bay release lever (identified by a white triangle (A) at the top of each DIMM back). Push and lift upwards on the lever. The lever should move backwards and up, releasing the DIMM slots to swing out and making them easily accessible. Do not use excessive force on the release lever as you risk damaging the latch.
3. Locate the DIMM(s) you want to remove. The slots are numbered 1-4 (B). Using your thumb and index finger from each hand, gently grip the DIMM at each end and carefully remove the DIMM by pulling the DIMM straight out of the DIMM slot. Do not twist or force the DIMM out of the socket or damage may occur. Remove the outer DIMMs first to make the inner DIMMs easier to remove.
4. Place the removed DIMMs into an ESD (electrostatic discharge) protective bag.

Part 3: Installing DIMMs

Each DIMM (F) has a notch (E) that must line up with the key (D) inside of the DIMM slot (C). Note: The key/notch position is different on each side of the computer.

1. Locate the DIMM slot closest to the interior of the computer and confirm that no DIMM is there.
2. If available, use canned air to blow dust and other contaminants out of the DIMM slot. Note: Keep the can vertical to avoid spraying propellants onto the DIMM slots.
3. Gently hold the DIMM ends and insert it into the slot. Ensure horizontal alignment of the DIMM prior to applying any force.
4. Insert the DIMM at the angle determined by the open DIMM mechanism.
5. Insert gently until bottom edge of DIMM is touching the gold contacts, then apply more force to fully seat the DIMM.
   • Do NOT force the DIMM. If the DIMM doesn't insert, verify that the key (D) and notch (E) are aligned.
   • Do NOT rock the DIMM into the seated position.
   • Do NOT insert DIMMs while the DIMM mechanism is in the locked position.
   • Do NOT bend or twist the DIMM during insertion.
6. Press the RAM bay back into place after installing all DIMMs.

Part 4: Reinstall the enclosure

1. Carefully lower the enclosure over the Mac Pro being careful not to touch any of the circuit boards.
2. You may need to gently push down on the enclosure in order for it to seat fully.
3. Once the enclosure is fully seated, slide the enclosure latch to the left to lock it.
4. If the enclosure latch does not move all of the way to the left, verify that the enclosure is properly installed and fully seated, then try again.
5. You are now ready to connect a power cord, display, and other peripherals. Power on your Mac Pro and verify that your system is operating properly.

Memory verification

To be sure that you correctly installed the memory and that it's recognized by the Mac Pro, follow these steps.

1. From the Apple () menu, choose About this Mac.
2. Click More Info. A window with general information about your Mac will appear.
3. Click the System Report button to bring up more detailed information on the memory installed in the computer.
4. Click the Memory tab.
5. Check to be sure that the memory you installed is listed and appears as you expect it to. In the image below, the DIMMs are annotated (DIMM1, DIMM2, DIMM3, DIMM4) so you can identify the corresponding DIMMs which are numbered 1, 2, 3, and 4 at the bottom of the DIMM mechanism.
6. If one or more memory slots that you installed memory in are listed as empty, shut down your computer and follow the steps again to verify that the memory is correctly installed. Refer to Mac Pro (Late 2013) Memory Specifications to confirm that the memory meets the requirements for your Mac Pro.
7. If you continue to have issues with memory you installed, Contact Apple Support for information about the support options available to you.

Mac Pro (2019) has 12 DIMM (memory) slots that support up to 1.5TB of 2933MHz memory when all 12 slots are full using DDR4 ECC DIMMs.

8-core, 12-core, and 16-core Mac Pro models support up to 768GB of memory.

Before you begin

You can use either R-DIMMs or LR-DIMMs with your Mac Pro, but you can't mix these memory types. To check if you have R-DIMMs or LR-DIMMs installed and view your memory status, choose Apple menu  > About This Mac, then select the Memory tab.

Make sure that you use the same type of memory when installing additional DIMMs or replacing DIMMs. Learn more about Mac Pro (2019) memory specifications.

Apple recommends that you use Apple-approved DIMMs. You can purchase memory upgrade kits by visiting an Apple Store or Apple Authorized Reseller. If you need to order replacement memory, contact Apple.

Check supported configurations

Mac Pro supports up to 12 DIMMs installed in configurations of 4, 6, 8, 10, or 12 DIMMs, as shown in the images below. These images can also be found on the inside of the DIMM covers. For maximum performance, install DIMMs in a 6 or 12 DIMM configuration. If you have R-DIMMs that aren't identical in capacity, learn how to install R-DIMMs of mixed capacities.

A 1 DIMM configuration is for diagnostic use only.

Each number represents a DIMM slot. For each DIMM configuration, insert DIMMs only into the dark grey slots and leave the light gray slots empty.

Installing R-DIMMs of mixed capacities

If you use 32GB DIMMs with other capacities, such as 8GB or 16GB, they must be installed according to these requirements:

• Use only R-DIMMs.
• Use a supported configuration.
• Install the 32GB DIMMs in the first slot of each channel pair.

Not all memory channels are used for every DIMM configuration. For example, an 8 DIMM configuration uses channels A, B, D, and E.

DIMM Channels

In the image above, the 12 slots on the left form 6 channel pairs as shown on the right. Each channel pair has slots designated DIMM 1 and DIMM 2.

Installing LR-DIMMs of mixed capacities

To install LR-DIMMs of mixed capacities, install your DIMMs in the slots determined by your configuration.

Remove or install memory

Learn how to remove the housing of your Mac Pro, remove DIMMs, and install DIMMs.

Remove the housing or memory access door

Follow the steps to remove the housing on Mac Pro (2019) or the access door on Mac Pro (Rack, 2019).

Mac Pro (2019)

1. Shut down your Mac Pro.
2. Wait approximately 5-10 minutes for the computer to cool down.
3. Unplug all cables except the power cord from your computer.
   
4. Touch the metal housing on the outside of the Mac Pro to discharge any static electricity, then unplug the power cord.
   Always discharge static before you touch parts or install components inside your Mac Pro. To avoid generating static, don’t move around the room until you finish installing the memory and slide the enclosure back onto the computer.
5. Flip the top latch up, then twist left to unlock the housing.
   
6. Lift the housing straight up and off of the computer. Carefully set it aside.
   Mac Pro won't turn on when its cover is removed.

Mac Pro (Rack, 2019)

1. Shut down your Mac Pro.
2. Wait approximately 5-10 minutes for the computer to cool down.
3. Unplug all cables except the power cord from your Mac Pro.
   
4. Touch the metal housing on the outside of the Mac Pro to discharge any static electricity, then unplug the power cord.
   Always discharge static before you touch parts or install components inside your Mac Pro. To avoid generating static, don’t move around the room until you finish installing memory and install the access door back onto the computer.
5. Stand your Mac Pro on its end.
   
6. Push in the top of the latches, then pull the latches to remove the access door.
   

Remove DIMMs

Your Mac Pro ships with DIMMs preinstalled in some or all of the DIMM slots. Before you can install memory, you might need to remove some of the DIMMs to match a supported configuration or to meet mixed capacity R-DIMM installation requirements.

1. Slide each lock to the left to unlock and open the DIMM covers.
   
   
2. Remove the DIMM covers.
   
3. Locate the DIMM(s) that you want to remove. Each slot is labeled with a number. Push down on the DIMM ejectors on each end of the DIMM, which slightly raises the DIMM out of the slot.
   
4. Use your thumb and index finger from each hand to gently grip the DIMM at each end, then carefully remove the DIMM by pulling the DIMM straight out of the DIMM slot. Don’t twist or force the DIMM out of the socket or damage might occur.
5. Place the removed DIMMs into an electrostatic discharge (ESD) protective bag.

Install DIMMs

1. Locate an empty DIMM slot.
   
2. If possible, use canned air to blow dust out of the DIMM slot. Keep the can vertical.
3. Gently hold the DIMM ends and insert it into the slot. Make sure the DIMM is aligned with the slot before applying any force to insert it. When you insert the DIMM, make sure to follow these guidelines:
   • Don’t force the DIMM. If the DIMM doesn’t insert, verify that the notch and connectors are aligned with the notch in the DIMM slot.
   • Don’t rock the DIMM into the seated position.
   • Don’t bend or twist the DIMM when you insert it.
     
4. Insert the DIMM gently until the bottom edge of the DIMM is touching the gold contacts, then apply more force to fully seat the DIMM. The DIMM ejectors click into place once the DIMM is fully seated.
5. Replace the DIMM covers. Push down on the left side of the covers until they click into place.
   

If you don't replace the DIMM covers, system performance may be affected.

Reinstall the housing or top cover

Follow the steps to reinstall the housing on Mac Pro (2019) or the top cover on Mac Pro (Rack, 2019).

Mac Pro (2019)

Dimm For Mac

1. Lower the housing over the Mac Pro.
   
2. After the housing is fully seated, twist the top latch right and flip it down to lock it.
   
   Top: Locked position (dots match)
   Bottom: Unlocked position (dots do not match)
3. Connect the power cord, display, and any other peripherals.

Mac Pro (Rack, 2019)

1. Reinstall the access door.
   
2. Reinstall your Mac Pro into the rack.
3. Connect the power cord, display, and any other peripherals.

Verify your memory

To check the status of your memory, choose Apple menu  > About This Mac, then select the Memory tab.

If your DIMMs should be configured in different slots to maximize performance, macOS notifies you with recommendations for which slots to use for your currently installed DIMMs.

Other configurations

800 Mhz Ddr2 Fb-dimm For Mac Pro Early 2008

If you want to test any single channel or the DIMM itself, you can use a 1 DIMM configuration by installing a single DIMM into the first slot of a channel. If you want to test the second slot of a channel, install DIMMs into both slots of a channel.

Learn more

Macbook Pro

• If you received a replacement part from Apple, follow the steps to send your original part back to Apple.
• Look up Mac Pro (2019) memory specifications.
• Learn about some of the PCIe cards you can install in your Mac Pro.
• Install and replace parts in your Mac Pro.