Lenovo ThinkSystem SD550 V3 User Manual page 58

Memory module installation guideline
• The following memory configurations and population sequences are supported on ThinkSystem SD550
V3:
– "DRAM DIMMs installation order" on page 49
• At least one DIMM is required for each processor. Install at least eight DIMMs per processor for good
performance.
• When a DIMM is replaced, the node provides automatic DIMM enablement capability without requiring
you to use the Setup Utility to enable the new DIMM manually
Attention:
• Install DIMMs of the same speed for optimal performance. Otherwise, the BIOS will find and run the
lowest speed among all channels.
• Within a channel, always populate DIMMs with the maximum number of ranks in the farthest DIMM slot,
followed by the nearest DIMM slot.
• When a processor is installed, each of the DIMM slots connected to the processor must be installed with a
DIMM or DIMM filler.
– DIMM slots 1-8 are connected to processor 1
– DIMM slots 9-16 are connected to processor 2
ThinkSystem SD550 V3 User Guide
48
(RDIMMs or 3DS RDIMMs)