Operator has 2x Dell R640 at 768 GB each and asked whether the memory is
interchangeable with the R750xa. Both are DDR4 RDIMM platforms and Dell
does not vendor-lock DIMMs, so the answer is very likely yes.
- 16 slots in the R750xa x 32 GB = 512 GB, double the factory spec, and
it deletes the 8x M04W6 purchase.
- Gating question is RDIMM vs LRDIMM. 24x 32 GB 2Rx4 RDIMM is the safe
and most likely case; 12x 64 GB LRDIMM needs Ice Lake support checked.
- Cleanest harvest is to strip one R640 entirely and leave the other
whole, rather than half-emptying both into unbalanced populations.
Separately, reading the factory CSV to answer this surfaced a gap in the
diff table: the reseller also swapped 2x Xeon Platinum 8362 (32C/64T,
265 W, DDR4-3200) for 2x Xeon Silver 4314 (16C/32T, 135 W, DDR4-2666).
The Silvers were recorded under "As bought" but never diffed, so the swap
went unremarked. Two consequences: the box cannot use the 3200 rating the
buy list was paying for, which makes 2666 R640 DIMMs a free lunch; and
the CPUs draw 260 W less, which the existing ~1,020 W power figure
already assumed correctly.
Memory-only; no version bump per the SemVer SKIP list.
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