Dimm Installation Rules - Lenovo ThinkSystem SR650 Maintenance Manual

Step 1. Open the retaining clips on each end of the DIMM slot.
Attention: To avoid breaking the retaining clips or damaging the DIMM slots, handle the clips
gently.
Step 2. Grasp the DIMM at both ends and carefully lift it up to remove it from the slot.
After removing a DIMM:
1. Install a DIMM filler or a new DIMM to cover the slot. See "Install a DIMM" on page 138.
2. If you are instructed to return the old DIMM, follow all packaging instructions and use any packaging
materials that are provided.

DIMM installation rules

DIMMs must be installed in a specific order based on the memory configuration that you implement on your
server.
Your server has 24 DIMM slots and it has the following features:
• Each slot supports 8 GB, 16 GB, and 32 GB DDR4 RDIMMs with Error Checking and Correcting (ECC)
technology.
• Each slot supports 64 GB DDR4 LRDIMMs with ECC technology.
• Each slot supports 128 GB DDR4 3DS RDIMMs with ECC technology.
• Your server supports up to 12 DIMMs when one processor is installed, and up to 24 DIMMs when two
processors are installed.
• The minimum system memory is 8 GB (only one processor installed and only one 8 GB RDIMM installed in
the CPU1 DIMM5 slot).
• The maximum system memory is as follows:
– 768 GB using RDIMMs (two processors installed and one 32 GB RDIMM installed in each of the 24
DIMM slots)
– 1.5 TB using LRDIMMs (two processors installed and one 64 GB LRDIMM installed in each of the 24
DIMM slots)
– 3 TB using 3DS RDIMMs (two processors installed and one 128 GB 3DS RDIMM installed in each of the
24 DIMM slots)
For a list of supported DIMM options, see:
http://www.lenovo.com/us/en/serverproven/
Before installing a DIMM, ensure that all DIMMs to be installed must be the same type. Your server supports
the following types of DIMMs:
• DDR4 RDIMM with ECC technology
• DDR4 LRDIMM with ECC technology
• DDR4 3DS RDIMM with ECC technology
Note: It is recommended to install DIMMs with the same rank in each channel.
The following illustration helps you to locate the DIMM slots on the system board.
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Chapter 3 Hardware replacement procedures
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