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Turn off the computer and wait three to ve minutes to let the computer cool before installing or
replacing a memory module.
Your computer has 16 slots for installing or replacing DDR3 ECC UDIMMs or DDR3 ECC RDIMMs. When
installing or replacing a memory module, use the following guidelines:
• Use either DDR3 ECC UDIMMs or DDR3 ECC RDIMMs for your computer. Do not install both the
UDIMMs and RDIMMs into the same computer.
• Use 2 GB, 4 GB, or 8 GB UDIMMs in any combination up to a maximum of 128 GB.
• Use 2 GB, 4 GB, 8 GB, 16 GB, or 32 GB DDR3 RDIMMs in any combination up to a maximum of 512 GB.
• Always install DIMMs in the numerical order printed on the system board (DIMM1, DIMM2, DIMM3,
and so on). Install memory modules into the blue color memory slots rst. See “Locating parts on the
system board” on page 58.
• If your computer has only one microprocessor installed, be sure to install memory modules only in the
memory slots adjacent to that microprocessor.
• If your computer has two microprocessors installed, install equal numbers of memory modules in both
sets of microprocessor DIMM slots for maximum performance.
To install or replace a memory module, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 64.
3. Lay the computer on its side for easier access to the system board.
4. Locate the memory slots. See “Locating parts on the system board” on page 58.
5. Remove any parts that might prevent your access to the memory slots. Depending on your computer
model, you might need to remove the PCI Express x16 graphics card for easier access to the memory
slots. See “Installing or replacing a PCI card” on page 66
.
6. For some computer models, you might need to remove the memory fan duct to get access to the
memory slots. To remove the memory fan duct, disconnect the memory fan cable from the system
board. See “Locating parts on the system board” on page 58.
7. Pull the fan duct tab outward and pivot the fan duct, and then disengage the rear of the fan duct.
Note: Not all computer models have the memory fan duct.
Figure 10. Removing the memory fan duct
8. Depending on whether you are installing or replacing a memory module, do one of the following:
70 ThinkStation Hardware Maintenance Manual