The SR630 V3 packs the same thirty-two-slot DDR5 memory subsystem as its 2U sibling into one rack unit, which makes it the density play: maximum compute and memory per U for virtualization farms and scale-out databases. The 1U constraint changes nothing about the memory rules — same 4th/5th-gen Xeon platform, same RDIMM and 3DS RDIMM support, same channel architecture — so the buying problem is identical: source the right DDR5 parts at the least bad price in a shortage market.
One Lenovo-specific rule deserves the highlight it gets in the box below: the SR630 V3 supports only specific DIMM quantities per processor — 1, 2, 4, 6, 8, 12, or 16 — not arbitrary counts. Plan upgrades to land on a supported quantity, or the configuration simply is not valid. The live table and the upgrade scenarios below respect the platform's slot count; the quantity rule is yours to carry into the order.
Up to 5600 MT/s at 1DPC and 4800 MT/s at 2DPC with 5th Gen Xeon Scalable; 4800 at 1DPC and 4400 at 2DPC with 4th Gen.
4th or 5th Gen Intel Xeon Scalable; 8 memory channels per CPU, 2 DIMMs per channel. Supports TruDDR5, 9x4 and 3DS RDIMMs.
Source: Lenovo official documentation
Operating speed depends on CPU generation and DIMMs per channel — Up to 5600 MT/s at 1DPC and 4800 MT/s at 2DPC with 5th Gen Xeon Scalable; 4800 at 1DPC and 4400 at 2DPC with 4th Gen.. Always verify against Lenovo's QVL for your exact configuration.
| Brand | Module | Capacity | Speed | Type | $/GB | Price | |
|---|---|---|---|---|---|---|---|
| V-Color | B0GYCQNYQ6 | 256GB | DDR5-4800 | RDIMM | $25.78 | $6599.99 | Buy → |
| Samsung | M321R2GA3BB6-CQK | 16GB | DDR5-4800 | RDIMM | $28.13 | $450.00 | Buy → |
| Samsung | M321R4GA3BB6-CQK | 32GB | DDR5-4800 | RDIMM | $29.00 | $928.00 | Buy → |
| A-Tech | M321R4GA0PB0-CWM | 32GB | DDR5-5600 | RDIMM | $29.18 | $933.68 | Buy → |
| Samsung | M321R8GA0BB0-CQK | 64GB | DDR5-4800 | RDIMM | $30.55 | $1955.00 | Buy → |
| NEMIX | MTC20F2085S1RC48BR | 32GB | DDR5-4800 | RDIMM | $30.90 | $988.88 | Buy → |
| SK Hynix | HMCG88AEBRA168N | 32GB | DDR5-4800 | RDIMM | $31.13 | $996.26 | Buy → |
| A-Tech | B0DMC1VFNS | 96GB | DDR5-4800 | RDIMM | $31.15 | $2989.99 | Buy → |
| Samsung | M321RYGA0BB0-CQK | 96GB | DDR5-4800 | RDIMM | $31.15 | $2989.99 | Buy → |
| SK Hynix | HMCT04MEERA132N | 128GB | DDR5-4800 | RDIMM | $31.25 | $3999.99 | Buy → |
| Kingston | KSM56R46BD4PMI | 64GB | DDR5-5600 | RDIMM | $32.25 | $2064.00 | Buy → |
| Kingston | KSM56E46BD8KM | 48GB | DDR5-5600 | RDIMM | $33.33 | $1599.99 | Buy → |
| NEMIX | MTC10F1084S1RC56BR | 16GB | DDR5-5600 | RDIMM | $33.93 | $542.88 | Buy → |
| V-Color | B0GYCHJPHZ | 256GB | DDR5-6400 (runs at up to 5600 here) | RDIMM | $34.06 | $8719.99 | Buy → |
| A-Tech | B0DYR9JXRH | 64GB | DDR5-6400 (runs at up to 5600 here) | RDIMM | $34.29 | $2194.49 | Buy → |
| Micron | MTC40F2046S1RC56BD2 | 64GB | DDR5-5600 | RDIMM | $37.50 | $2399.99 | Buy → |
| NEMIX | MTC40F204WS1RC56BB2R | 96GB | DDR5-5600 | RDIMM | $37.50 | $3599.99 | Buy → |
| NEMIX | MTC40F204WS1RC64BC1R | 96GB | DDR5-6400 (runs at up to 5600 here) | RDIMM | $38.54 | $3699.99 | Buy → |
| NEMIX | MTC40F204WS1RC64BR | 96GB | DDR5-6400 (runs at up to 5600 here) | RDIMM | $38.54 | $3699.99 | Buy → |
| Kingston | KSM56R46BD8PMI | 32GB | DDR5-5600 | RDIMM | $44.50 | $1424.00 | 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 32 DIMM slots. Populate channels per the OEM rules below for full bandwidth.
Only DIMM quantities of 1, 2, 4, 6, 8, 12 or 16 per processor are supported; other quantities are not supported.
Speed behavior on this platform: Up to 5600 MT/s at 1DPC and 4800 MT/s at 2DPC with 5th Gen Xeon Scalable; 4800 at 1DPC and 4400 at 2DPC with 4th Gen. 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.
Plan SR630 V3 orders on the legal-quantity ladder (1, 2, 4, 6, 8, 12, 16 per CPU) and buy each rung as one purchase of one part number — the platform's validation model rewards uniformity and the DDR5 market punishes split orders with drift. The scenarios above price the common rungs live; the table's per-module links carry the timing charts.
For dense-rack fleets, standardization across chassis is worth more here than anywhere: one blessed part number across every SR630 V3 in the row makes spares universal, troubleshooting boring, and volume purchasing possible. Pick it from the live table's cheapest reliable tier, verify it on ServerProven, and stop thinking about memory until the next capacity review.
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.
The SR630 V3's natural owners are dense-rack operators: cloud providers, colo tenants paying per U, and enterprises standardizing on 1U pizza boxes. For them memory is usually the binding constraint before CPU — a 1U host runs out of RAM for VMs long before it runs out of cores — which makes the $/GB column below the number that decides how many more workloads each chassis can absorb.
Because the platform is young, its upgrade market is entirely new-parts: there is no meaningful used DDR5 RDIMM supply yet. That removes the refurb decision but sharpens the timing one — DDR5 listings swing hard week to week, and the per-module 90-day charts linked from the table are the practical tool for catching a dip on the specific part number your channels need.
Lenovo's documentation puts the platform maximum at 8TB across 32 DIMM slots, with single modules supported up to 256GB. 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.
DDR5 RDIMM and 3DS at 4400 to 5600 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: Only DIMM quantities of 1, 2, 4, 6, 8, 12 or 16 per processor are supported; other quantities are not supported. 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 5600 MT/s downclock to the platform's supported speed and run normally, which is why the table marks them "runs at up to 5600 here". Modules rated below 4400 MT/s are excluded from the table because Lenovo does not list them as supported.
8× 64GB fills 512GB and leaves 24 of the 32 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.
For DDR5 platforms like this one there is effectively no refurbished market yet — the fleets that would feed it are still in service. Buy new, verify the part against Lenovo's QVL, and use each module's 90-day price chart (linked in the table) to time the purchase.
Lenovo validates only specific per-processor DIMM quantities (1, 2, 4, 6, 8, 12, 16). An unsupported count is not a slower configuration — it is an unsupported one. Decide your target capacity, then reach it with a supported quantity of equal modules.