The SR630 is the 1U counterpart of the DDR4-era SR650 and shares its memory DNA: twenty-four slots, six channels per Xeon Scalable processor, TruDDR4 at 2666 or 2933 MT/s by CPU generation. As an upgrade target in 2026 it is pure value play — the platform is deep into its lifecycle, its memory is the affordable side of the shortage, and its slots are usually half empty because original configurations were specified to a budget.
Lenovo's population documentation is unambiguous for this platform and the rules box below reflects it: types never intermix, six channels per processor with two DIMMs each, and a defined minimum configuration. The compatible modules in the live table below have already passed the generation, type, and speed-floor checks against those rules — what remains is matching quantities to your channel layout.
2666 MT/s DIMMs with 1st Gen (Skylake); up to 2933 MT/s with 2nd Gen (Cascade Lake), depending on processor.
LRDIMMs (64GB quad-rank) supported with 1st Gen Xeon SP only; 2nd Gen supports RDIMM 8-64GB and 3DS 64/128GB. Max 768GB RDIMM / 1.5TB LRDIMM / 3TB 3DS (Gen1); 1.5TB RDIMM / 3TB 3DS (Gen2).
Source: Lenovo official documentation
Operating speed depends on CPU generation and DIMMs per channel — 2666 MT/s DIMMs with 1st Gen (Skylake); up to 2933 MT/s with 2nd Gen (Cascade Lake), depending on processor.. Always verify against Lenovo's QVL for your exact configuration.
| Brand | Module | Capacity | Speed | Type | $/GB | Price | |
|---|---|---|---|---|---|---|---|
| A-Tech | B0BPN414ZJ | 64GB | DDR4-2666 | LRDIMM | $4.31 | $275.96 | Buy → |
| A-Tech | B0BPN4FLDX | 32GB | DDR4-2666 | RDIMM | $5.02 | $160.53 | Buy → |
| Micron | MTA36ASF4G72PZ | 32GB | DDR4-2666 | RDIMM | $5.47 | $175.00 | Buy → |
| Samsung | M393A8K40B22-CWD | 64GB | DDR4-2666 | RDIMM | $6.23 | $399.00 | Buy → |
| Supermicro | B07DFLTWN3 | 64GB | DDR4-2666 | LRDIMM | $6.23 | $399.00 | Buy → |
| SK Hynix | HMA84GR7CJR4N-VK | 32GB | DDR4-2666 | RDIMM | $6.72 | $214.94 | Buy → |
| Samsung | M393A4K40CB2-CTD | 32GB | DDR4-2666 | RDIMM | $6.81 | $218.01 | Buy → |
| A-Tech | B0C2FML23M | 64GB | DDR4-2933 | RDIMM | $8.06 | $515.96 | Buy → |
| A-Tech | KTD-PE429 | 64GB | DDR4-2933 | RDIMM | $8.28 | $530.11 | Buy → |
| Samsung | M393A2K43CB2-CTD8Q | 16GB | DDR4-2666 | RDIMM | $8.37 | $133.99 | Buy → |
| A-Tech | B0BPN4L74H | 32GB | DDR4-2933 | RDIMM | $9.11 | $291.60 | Buy → |
| A-Tech | B0CGJFB4TG | 32GB | DDR4-2933 | RDIMM | $9.33 | $298.70 | Buy → |
| SK Hynix | HMAA8GR7AJR4N-XN | 64GB | DDR4-3200 (runs at up to 2933 here) | RDIMM | $9.36 | $599.00 | Buy → |
| Samsung | M393A8G40BB4-CWE | 64GB | DDR4-3200 (runs at up to 2933 here) | RDIMM | $9.98 | $639.00 | Buy → |
| A-Tech | MTA36ASF8G72PZ | 64GB | DDR4-3200 (runs at up to 2933 here) | RDIMM | $10.56 | $675.95 | Buy → |
| Samsung | M393A2K43BB1-CTD6Q | 16GB | DDR4-2666 | RDIMM | $10.97 | $175.49 | Buy → |
| Kingston | KTD-PE426 | 32GB | DDR4-2666 | RDIMM | $11.09 | $354.96 | Buy → |
| Samsung | M393A2K43DB2-CTD6Y | 16GB | DDR4-2666 | RDIMM | $12.19 | $194.99 | Buy → |
| Samsung | M393A8G40AB2-CWE | 64GB | DDR4-3200 (runs at up to 2933 here) | RDIMM | $12.48 | $799.00 | Buy → |
Each scenario is priced from the cheapest compatible in-stock module at that capacity, at the timestamp above. Configurations never exceed the platform's 24 DIMM slots. Populate channels per the OEM rules below for full bandwidth.
Memory types cannot be intermixed. Six memory channels per processor with two DIMMs per channel; minimum system memory is 8GB (one 8GB RDIMM in processor 1 slot 5).
Speed behavior on this platform: 2666 MT/s DIMMs with 1st Gen (Skylake); up to 2933 MT/s with 2nd Gen (Cascade Lake), depending on processor. Faster-rated modules from the table above are safe — they operate at the platform's supported speed for your configuration rather than their label speed.
Paraphrased from Lenovo's official documentation. Anything the manual does not state is omitted here rather than guessed.
The SR630 buys like its 2U sibling with one extra note from the manual: LRDIMM support belongs to the 1st-gen processor era, so 2nd-gen boxes shop the RDIMM and 3DS tiers only. For the realistic capacities — 128GB to 768GB — matched RDIMMs in Lenovo's documented slot order are the whole playbook, at DDR4 prices that make the exercise pleasantly boring.
Its 1U economics mirror the DL360's: at pull prices, doubling memory across a row of SR630s costs less than adding a single new host and usually helps more. The live table is deliberately cross-brand for exactly this arithmetic — the cheapest compliant part number wins, whatever the label says.
Every specification in the rules box above was verified against the Lenovo document linked beneath it before this page went live — nothing is inferred from forum lore or reseller listings, and any field the document does not state is simply absent here rather than guessed. The compatibility table applies those verified rules mechanically to our tracked module catalog: generation must match, the module type must appear in the platform's allowed list, speed must meet the documented floor, and per-DIMM capacity must respect the stated maximum. What survives that filter is sorted by live $/GB — computed against true 1024-based capacities — and refreshed on the same rolling cycle as every price on this site.
Two honest limits worth stating. First, our catalog tracks the retail module market, not Lenovo's option-part universe — a module absent from the table is not declared incompatible, merely untracked; the rules box tells you what any candidate must satisfy. Second, a compatibility table is not a QVL: Lenovo validates specific part numbers against specific configurations, and the disclaimer above the table is not boilerplate but the actual final step. Use this page to find the market's honest price for compliant memory; use the vendor's QVL to bless the exact part before a production order.
SR630s in 2026 mostly serve two masters: enterprises running them as standardized compute bricks with two to four years of planned life remaining, and the secondary market, where off-lease units have become a homelab staple — a 1U dual-socket Xeon platform whose complete memory loadout costs less than a single new DDR5 module. Both buyers should price used alongside new: the same decommissioning wave that supplies the servers supplies tested 16GB and 32GB RDIMM pulls.
The practical ceiling question — is 1U enough — is about heat and noise rather than memory: the SR630 takes the same DIMMs to the same capacities as its 2U sibling. For rack-dense deployments that is the point; for a home office, the 2U SR650's quieter fans are worth knowing about before the auction closes.
Lenovo's documentation puts the platform maximum at 3TB across 24 DIMM slots, with single modules supported up to 128GB. Reaching the maximum requires the largest supported DIMM in every slot — most real upgrades target far less, which is what the live scenarios above price.
DDR4 RDIMM and LRDIMM and 3DS at 2666 to 2933 MT/s, per Lenovo's documentation. Consumer non-ECC and XMP/EXPO kits are not supported — every module in the table above is a verified ECC server part of the correct type.
Lenovo's stated rules: Memory types cannot be intermixed. Six memory channels per processor with two DIMMs per channel; minimum system memory is 8GB (one 8GB RDIMM in processor 1 slot 5). Mixed speeds, where allowed, run at the slowest module's speed — buying identical part numbers per channel remains the safe pattern.
Yes — modules rated above 2933 MT/s downclock to the platform's supported speed and run normally, which is why the table marks them "runs at up to 2933 here". Modules rated below 2666 MT/s are excluded from the table because Lenovo does not list them as supported.
8× 64GB fills 512GB and leaves 16 of the 24 slots free for later growth. Fewer, larger DIMMs preserve expansion room; more, smaller DIMMs are sometimes cheaper per GB — the live table above lets you price both routes at today's numbers.
Used and refurbished DDR4 ECC is a rational choice for this platform — DRAM has no meaningful wear mechanism, and tested pulls from decommissioned fleets often undercut new pricing substantially. Run memtest86+ on arrival and watch ECC counters for the first weeks. For production fleets, new modules with warranty remain the conservative default.
Eight 32GB RDIMMs (four per processor in a dual-socket unit) lands on a Lenovo-supported quantity, balances channels reasonably, and uses the capacity tier with the deepest competition — check the live table above for today's cheapest 32GB part and multiply by eight for the real number.