DDR5 RDIMMs mixed with CXL memory modules
This section contains information about how to install DDR5 RDIMMs mixed with CXL memory modules (CMMs) properly.
Servers with Compute Complex Neptune Core Module do not support CMMs.
CMM channel: number of devices per root port, with root ports separated by
+
, e.g. 2+2+2+2 = four root ports populated with two devices per root port- CMM modes:
1LM+Vol = Native DDR5 (1LM) and (volatile) CMM visible to software (SW) as separate tiers, separately interleaved
- Hetero x12 = DDR5 and (volatile) CMM interleaved together in one 12-way setNoteThe
Hetero mode is not supported with LCC processors. For specific models of LCC processors, see the Processors
section inSR650 V4 Product Guide.
For CMM configurations, see E3.S chassis without Compute Complex Neptune Core Module or E3.S chassis with Compute Complex Neptune Core Module.
To set the CMM mode, go to
.
DDR5 RDIMMs | CMM | ||||
---|---|---|---|---|---|
Slot 0 DIMMs | Slot 1 DIMMs | RDIMM mode | CMM mode | CMM capacity per module | CMM channels |
8 x 128 GB (2Rx4) | N/A | Independent/mirroring | 1LM+Vol | 128 GB | 2, 2+2, or 2+2+2 |
N/A | Independent | Hetero | 128 GB | 2+2 | |
8 x 128 GB (2Rx4) | Independent/mirroring | 1LM+Vol | 128 GB | 2, 2+2, or 2+2+2 | |
8 x 64 GB (2Rx4) | N/A | Independent/mirroring | 1LM+Vol | 128 GB | 2, 2+2, or 2+2+2 |
8 x 64 GB (2Rx4) | |||||
8 x 96 GB (2Rx4) | N/A | Independent/mirroring | 1LM+Vol | 96 GB | 2, 2+2, or 2+2+2 |
8 x 96 GB (2Rx4) |
DDR5 RDIMMs | CMM per socket | ||||
---|---|---|---|---|---|
Slot 0 DIMMs | Slot 1 DIMMs | RDIMM mode | CMM mode | CMM capacity per module | CMM channels |
16 x 128 GB (2Rx4) | N/A | Independent/mirroring | 1LM+Vol | 128 GB | 2, 2+2, or 2+2+2 |
N/A | Independent | Hetero | 128 GB | 2+2 | |
16 x 128 GB (2Rx4) | Independent/mirroring | 1LM+Vol | 128 GB | 2, 2+2, or 2+2+2 | |
16 x 64 GB (2Rx4) | N/A | Independent/mirroring | 1LM+Vol | 128 GB | 2, 2+2, or 2+2+2 |
16 x 64 GB (2Rx4) | |||||
16 x 96 GB (2Rx4) | N/A | Independent/mirroring | 1LM+Vol | 96 GB | 2, 2+2, or 2+2+2 |
16 x 96 GB (2Rx4) |
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