DDR5 RDIMMs mixed with CXL memory modules
This section contains information about how to install DDR5 RDIMMs mixed with CXL memory modules (CMMs) properly.
CMM configurations are 1 DPC (slot 0) only for native DDR5 DIMMs.
CMM channel: number of devices per root port, with root ports separated by
+
, e.g. 2+2 = one root port 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 set
NoteThe Hetero mode is not supported with LCC processors. For specific models of LCC processors, see theProcessors
section inSR630 V4 Product Guide. For CMM configurations, see Cable routing for E3.S drive backplanes.
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 64 GB (2Rx4) | N/A | Independent/mirroring | 1LM+Vol | 128 GB | 2 or 2+2 |
8 x 64 GB (2Rx4) | Independent/mirroring | 1LM+Vol | 128 GB | 2 or 2+2 | |
8 x 96 GB (2Rx4) | N/A | Mirroring | 1LM+Vol | 96 GB | 2 or 2+2 |
8 x 96 GB (2Rx4) | Mirroring | 1LM+Vol | 96 GB | 2 or 2+2 | |
8 x 128 GB (2Rx4) | N/A | Independent/mirroring | 1LM+Vol | 128 GB | 2 or 2+2 |
N/A | Independent | Hetero | 128 GB | 2+2 | |
8 x 128 GB (2Rx4) | Independent/mirroring | 1LM+Vol | 128 GB | 2 or 2+2 |
DDR5 RDIMMs | CMM per socket | ||||
---|---|---|---|---|---|
Slot 0 DIMMs | Slot 1 DIMMs | RDIMM mode | CMM mode | CMM capacity per module | CMM channels |
16 x 64 GB (2Rx4) | N/A | Independent/mirroring | 1LM+Vol | 128 GB | 2 or 2+2 |
16 x 64 GB (2Rx4) | Independent/mirroring | 1LM+Vol | 128 GB | 2 or 2+2 | |
16 x 96 GB (2Rx4) | N/A | Mirroring | 1LM+Vol | 96 GB | 2 or 2+2 |
16 x 96 GB (2Rx4) | Mirroring | 1LM+Vol | 96 GB | 2 or 2+2 | |
16 x 128 GB (2Rx4) | N/A | Independent/mirroring | 1LM+Vol | 128 GB | 2 or 2+2 |
N/A | Independent | Hetero | 128 GB | 2+2 | |
16 x 128 GB (2Rx4) | Independent/mirroring | 1LM+Vol | 128 GB | 2 or 2+2 |
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