The R750 is the last of Dell's mainstream 2U line to run DDR4, and in 2026 that is its quiet advantage: a thoroughly modern platform — 3rd-gen Xeon Scalable, PCIe 4, thirty-two DIMM slots to 8TB — fed by the affordable side of the memory market. Dell's ISM shows rated DDR4-3200 modules holding 3200 MT/s at both one and two DIMMs per channel, so this platform takes the fast DDR4 grades without the DPC penalty its predecessors carried.
The table below filters our tracked catalog to the R750's verified rules: registered and load-reduced DDR4 at the platform's supported grades. With the R750 generation now flowing into the secondary market, its memory economics keep improving — the same modules that fill it new are beginning to appear as tested pulls.
Technical specs list 3200 and 2933 MT/s; rated DDR4-3200 RDIMMs and LRDIMMs operate at 3200 MT/s at both 1DPC and 2DPC.
Up to two 3rd Gen Intel Xeon Scalable. Max 2TB single / 8TB dual processor; also supports Intel Persistent Memory 200 series.
Source: Dell official documentation
Operating speed depends on CPU generation and DIMMs per channel — Technical specs list 3200 and 2933 MT/s; rated DDR4-3200 RDIMMs and LRDIMMs operate at 3200 MT/s at both 1DPC and 2DPC.. Always verify against Dell's QVL for your exact configuration.
| Brand | Module | Capacity | Speed | Type | $/GB | Price | |
|---|---|---|---|---|---|---|---|
| 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 → |
| 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 | RDIMM | $9.36 | $599.00 | Buy → |
| Samsung | M393A8G40BB4-CWE | 64GB | DDR4-3200 | RDIMM | $9.98 | $639.00 | Buy → |
| A-Tech | MTA36ASF8G72PZ | 64GB | DDR4-3200 | RDIMM | $10.56 | $675.95 | Buy → |
| Samsung | M393A8G40AB2-CWE | 64GB | DDR4-3200 | 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 32 DIMM slots. Populate channels per the OEM rules below for full bandwidth.
Memory is organized into eight channels per processor (two memory sockets per channel), 16 memory sockets per processor and 32 per system.
Speed behavior on this platform: Technical specs list 3200 and 2933 MT/s; rated DDR4-3200 RDIMMs and LRDIMMs operate at 3200 MT/s at both 1DPC and 2DPC. 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 Dell's official documentation. Anything the manual does not state is omitted here rather than guessed.
The R750's happy quirk — DDR4-3200 held at full speed even at two DIMMs per channel — means capacity growth carries no bandwidth tax: fill toward thirty-two slots whenever the workload asks, without the DPC arithmetic its DDR5 successors impose. Buy 3200-rated modules as the default; the platform also documents 2933 operation, but the 3200 tier's market is deeper and the price difference is usually noise.
Mind the RDIMM/LRDIMM fork before ordering: whichever type the box runs today is a commitment, since Dell (like everyone) forbids mixing them. RDIMM configurations cover every realistic capacity through 2TB; LRDIMMs exist for the 8TB ceiling few fleets approach. If your slots are empty and you are choosing fresh, RDIMMs at the 32GB and 64GB tiers are where the live table's competition is fiercest.
One more planning angle the R750 rewards: because its DDR4-3200 diet overlaps the R650's exactly, mixed 1U/2U fleets of this generation can standardize a single module part number across every chassis they own. That concentration turns each memory purchase into a volume purchase, makes every spare universal, and reduces the QVL exercise to a single validation — worth more, over a fleet's life, than any single week's price dip in the table above.
As a final sanity check before any large order, pull the platform's ISM one more time from the link in the rules box — Dell revises these documents as new DIMM options validate, and thirty seconds against the source beats any cached spec, this page's included.
Every specification in the rules box above was verified against the Dell 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 Dell'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: Dell 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.
R750s are the backbone of countless 2021-2023 deployments now hitting their mid-life memory ceiling, and their owners hold the shortage's strongest hand: maxing out DDR4 on a platform with years of runway, at prices the DDR5 world can only envy. The budget meeting version: doubling an R750's memory typically costs less than a tenth of replacing it with a DDR5-generation equivalent at equal capacity.
The platform also supports Intel Optane PMem 200 alongside conventional DIMMs — a niche most owners never use, but worth knowing about before assuming every socket is a DRAM socket in a used unit's listing. For conventional upgrades, the eight-channel discipline applies: populate evenly, match part numbers per channel, and let the live table pick the brand.
Dell'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.
DDR4 RDIMM and LRDIMM at 2933 to 3200 MT/s, per Dell'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.
Dell's stated rules: Memory is organized into eight channels per processor (two memory sockets per channel), 16 memory sockets per processor and 32 per system. 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 3200 MT/s downclock to the platform's supported speed and run normally, which is why the table marks them "runs at up to 3200 here". Modules rated below 2933 MT/s are excluded from the table because Dell 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.
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.
Upgrade, in almost every case. The R750 is a current-workload-capable platform whose memory costs a fraction of DDR5 equivalents in the 2026 market. Our upgrade-economics coverage runs this math in detail — platform replacement only wins when CPU generations, not memory, are the binding constraint.