Installing Or Replacing A Memory Module - Lenovo ThinkStation P900 User Manual

Installing or replacing a memory module

Attention: Do not open your computer or attempt any repair before reading and understanding the "Read
this first: Important safety information" on page v.
Your computer has 16 slots for installing or replacing DDR4 DIMMs that provide up to a maximum of 1024
GB system memory. When installing or replacing a memory module, use the following guidelines:
• Use any of DDR4 ECC UDIMMs, DDR4 ECC RDIMMs, or DDR4 ECC LRDIMMs for your computer. Do not
install the UDIMMs, RDIMMs and LRDIMMs into the same computer.
• Use 4 GB or 8 GB UDIMMs in any combination up to a maximum of 128 GB.
• Use 8 GB 16 GB, or 32 GB RDIMMs in any combination up to a maximum of 512 GB.
• Use 32 GB or 64 GB LRDIMMs in any combination up to a maximum of 1024 GB.
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 73.
3. Remove the direct cooling air baffle. See "Removing and reinstalling the direct cooling air baffle"
on page 90.
4. Lay the computer on its side for easier access to the memory slots.
5. Locate the memory slot in which you want to install or replace a memory module.
Note: If your computer is installed with only one microprocessor, refer to the order of installing memory
modules shown on the left figure. If your computer is installed with two microprocessors, refer to the
order of installing memory modules shown on the right figure.
Figure 83. The order of installing memory modules
6. Depending on whether you are installing or replacing a memory module, do one of the following:
1 6
5
14
2 8
6 16
8 12
4 4
7 10
3 2
Chapter 9
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9
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Installing or replacing hardware
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