Lenovo ThinkStation P900 User Manual page 132

• Use 8 GB or 16 GB RDIMMs in any combination up to a maximum of 256 GB.
• Use 32 GB LRDIMMs in any combination up to a maximum of 512 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 77.
3. Remove the direct cooling air baffle. See "Removing and reinstalling the direct cooling air baffle"
on page 94.
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 59. The order of installing memory modules
6. Depending on whether you are installing or replacing a memory module, do one of the following:
• If you are installing a memory module, open the retaining clips of the memory slot into which you
want to install the memory module.
Figure 60. Opening retaining clips
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