The R740 carried Dell's 2U mainstream through the 14th generation, and hundreds of thousands of them are still earning their rack space in 2026 — which makes their 24 DDR4 slots one of the most common upgrade targets on the internet. Dell's spec sheet for the platform states support up to 2933 MT/s on 2nd-gen Xeon Scalable, with RDIMMs to 64GB and LRDIMMs to 128GB reaching a 3TB platform maximum.
A note on our table's strictness: because the spec sheet states the platform's speed as 'up to 2933 MT/s' without enumerating lower grades, we list only 2933-rated and faster modules here — faster grades downclock safely to the platform's ceiling. Owners running verified slower configurations from Dell's QVL lose nothing; our floor is simply the conservative reading of the document we cite.
Spec sheet states speeds up to 2933 MT/s (2nd Gen Xeon SP); lower grades are not enumerated there, so only 2933-rated and faster modules are listed here.
Up to two 2nd Gen Intel Xeon Scalable; registered ECC DDR4 only; also supports NVDIMM-N and Optane DC PMem.
Source: Dell official documentation
Operating speed depends on CPU generation and DIMMs per channel — Spec sheet states speeds up to 2933 MT/s (2nd Gen Xeon SP); lower grades are not enumerated there, so only 2933-rated and faster modules are listed here.. 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 (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 | 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.
RDIMM modules of 8-64GB (max 1536GB dual processor) and LRDIMM modules of 64-128GB (max 3TB dual processor) per the technical specifications.
Speed behavior on this platform: Spec sheet states speeds up to 2933 MT/s (2nd Gen Xeon SP); lower grades are not enumerated there, so only 2933-rated and faster modules are listed here. 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.
Buying for an R740 starts with a sticker check: which Xeon generation sits in the sockets. 2nd-gen (Cascade Lake) runs the 2933 grade our table floors at; 1st-gen (Skylake) caps at 2666, which our conservative floor excludes — those owners should shop the broader DDR4 hub where 2666 stock lives, knowing the platform itself is documented only to 'up to 2933' in the sheet we cite.
The used market is this platform's superpower: the same off-lease wave that supplies R740 chassis supplies their memory, and matched eight-module lots of 32GB RDIMMs from decommissions frequently beat any new price in the table. Apply the ritual — memtest86+ on arrival, ECC counters for a fortnight — and the R740 rewards you with the cheapest reliable capacity of its generation.
Sequencing a fleet-wide R740 top-up is mostly a market-reading exercise: the 2933 RDIMM tier this page tracks is fed continuously by decommissions, so its price direction over a quarter tends downward even mid-shortage — but individual listings vanish fast. The practical pattern is patience at the fleet level and decisiveness at the listing level: watch the table's cheapest qualifying part for a few refresh cycles, and when a matched lot at the right price appears, take the whole lot rather than the increment.
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.
The R740's 2026 constituency splits between enterprise holdouts — fleets on extended lifecycles where the platform still meets the workload and memory is the cheap way to keep it doing so — and the secondary market's biggest wave: off-lease R740s have become the default serious homelab and small-business server, typically arriving with half their DIMM slots empty. Both buyers shop the same DDR4 market, and both benefit from the same fact: this generation's memory is the most abundant tested-pull supply in existence.
For the used-market buyer specifically: confirm which Xeon generation the unit carries before buying the fast grades — 1st-gen Scalable CPUs cap at 2666 and the platform will downclock accordingly. And treat the seller's memory claims the way this site treats specs: verified against what is actually in the slots, or ignored.
Dell'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 at 2933 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: RDIMM modules of 8-64GB (max 1536GB dual processor) and LRDIMM modules of 64-128GB (max 3TB dual processor) per the technical specifications. 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 2933 MT/s are excluded from the table because Dell 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.
For its remaining service life, usually yes — the platform is mature, its DDR4 is the affordable side of the shortage, and memory transfers forward poorly across generation boundaries (DDR4 cannot follow you to a DDR5 platform). Size the buy to the server's realistic retirement date rather than its theoretical 3TB maximum.