Lenovo ThinkSystem SR645 Setup Manual page 121

Memory module installation rules
Memory modules must be installed in a specific order based on the memory configuration that you
implement on your server.
Your server has 8 channels, 32 memory slots, and supports:
• Minimum capacity:
– 16 GB using RDIMMs
– 128 GB using 3DS RDIMMs
• Maximum capacity:
– 2 TB using RDIMMs
– 4 TB using 3DS RDIMMs
• Type (depending on the model): TruDDR4 3200, dual-rank, 16 GB/32 GB/64 GB RDIMM
For a list of supported memory options, see:
Note: The operating speed and total memory capacity depend on the processor model and UEFI settings.
The following figure and table help you locate the memory slots and channels on the system board.
Figure 40. Memory module locations
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Chapter 4 Server hardware setup
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