Memory module

Attention:

Do not open your computer or attempt any repair before reading and understanding the Read this first: Important safety information.

Your computer has 16 slots for installing or replacing DDR4 DIMMs that provide up to a maximum of 4096 GB system memory. When installing or replacing a memory module, use the following guidelines:

Use any of DDR4 ECC RDIMMs or DDR4 ECC 3DS RDIMMs for your computer. Do not install the RDIMMs or 3DS RDIMMs into the same computer.
Use 8 GB, 16 GB, 32 GB, or 64 GB RDIMMs in any combination up to a maximum of 1024 GB.
Use 256 GB 3DS RDIMM up to a maximum of 4096 GB.

Memory module installation rules

Install memory modules in the alphabetic order as shown.

Figure 1. Memory module installation order for computers with one microprocessor

Figure 2. Memory module installation order for computers with two microprocessors

Note: To avoid performance loss, if the memory slots 1 are occupied while the adjacent memory slots 2 are empty, move the memory modules from slots 1 to the adjacent slots 2 respectively.

Figure 3. Additional notice for removing memory modules

To remove or install a memory module, do the following:

Prepare your computer. See Preparing your computer and removing the computer cover.
Remove the direct cooling air baffle. See Direct cooling air baffle.
Lay the computer on its side for easier access to the memory slots.
Locate the memory slot. See Parts on the system board.
To remove a memory module, open the retaining clips and gently pull the memory module out of the memory slot.
Figure 4. Removing the memory module
To install a memory module, do the following:
1. Open the retaining clips of the memory slot into which you want to install the memory module.
  Figure 5. Opening retaining clips
2. Position the new memory module over the memory slot. Ensure that the notch 1 on the memory module aligns correctly with the slot key 2 on the system board. Push the memory module straight down into the slot until the retaining clips close.
  Note: Do not touch the circuit board of the memory module.
  
  Figure 6. Installing the memory module
3. Reinstall the direct cooling air baffle. See Direct cooling air baffle.

What to do next:

To work with another piece of hardware, go to the appropriate section.
To complete the installation or replacement, go to Completing the parts replacement.