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DIMM Population Rules
The following population rules apply to the VSSEP1EC Server Module:
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One DIMM per channel (DPC)
Up to eight DIMMs per server module
Supports Registered DDR4 (RDIMM), Load-reduced DDR4
(LRDIMM) and LRDIMM 3DS DDR4 SDRAM
UDIMMs are not supported
Total memory:
Up to 2 TB of memory per server module, 4 TB per server system
Memory data rates are CPU SKU dependent:
Up to 3200 MT/s
Support for RDIMMs, LRDIMMs, and LRDIMM 3DS DDR4 memory
UDIMMs are not supported
DIMM sizes can range from 8 GB to 256 GB
X4 widths and X8 widths are supported
Best performance is achieved populating eight DIMMs from the same
manufacturer that are of equal capacity, speed, and configuration and
duplicating this configuration across both server modules
DIMM minimums
A minimum of one DIMM must be installed in any socket
DIMM slots may be populated in any order and are identified as A
through H in Figure 2.2 on page 17
For improved performance, utilize an even number of DIMMs with a
minimum of four DIMMs populated in the appropriate channels
Refer to the "AMD EPYC Memory Population Guidelines" available in the VES
Online Document Library.
When DIMM speeds, sizes, and/or configurations are mixed, the
server system (across both server modules) will use the slowest
common speed for all DIMMs
Chapter 2: About the VSSEP1EC Server Module
CTC-DOC-002293, Rev A.2
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