1
Table 30 DIMM rank classification label description
1 Capacity
Options include:
• 8GB.
• 16GB.
• 32GB.
•
.
2 Number of ranks
Options include:
• 1R— One rank (Single-Rank).
• 2R—Two ranks (Dual-Rank). A 2R DIMM is equivalent
to two 1R DIMMs.
• 4R—Four ranks (Quad-Rank).
equivalent to two 2R DIMMs
• 8R—Eight ranks (8-Rank). An 8R DIMM is equivalent
to two 4R DIMMs.
3 Data width
Options include:
• ×4—4 bits.
• ×8—8 bits.
4 DIMM generation DDR5
5 Data rate
• 2666V—2666 MHz.
• 2933Y—2933 MHz.
• 3200AA—3200 MHz.
• 4800—4800 MHz.
6 DIMM type
Options include:
• L—LRDIMM.
• R—RDIMM.
Guidelines
Only DDR5 DIMMs are supported.
If liquid cooled modules are installed, you must install two processors.
The server provides eight DIMM channels per processor and each channel has two DIMM slots. If
the server has one processor, the total number of DIMM slots is 16. If the server has two processors,
the total number of DIMM slots is 32.
When you install a DIMM, use Table 31 to verify that it is compatible with the processors.
Table 31 DIMM and processor compatibility
Processor Memory type @ frequency
Max memory size per
processor
Sapphire Rapids
DDR5 @4800MHz 6 TB
DIMM and processor compatibility
To obtain the memory frequency and maximum memory frequency supported by a specific
processor, use the component compatibility lookup tool at
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