The T440 is the tower in Dell's 14th generation — a quiet, office-tolerable chassis wrapping the same 2nd-gen Xeon Scalable platform as the rack R740, with sixteen DDR4 DIMM slots to 1TB. It is the classic small-business server: bought once, upgraded rarely, and asked to run everything from the domain controller to the accounting database for most of a decade.
Dell's spec sheet states RDIMM and LRDIMM support at speeds up to 2666 MT/s; because lower grades are not enumerated there, our table lists 2666-rated and faster modules only — the faster grades downclocking safely to the platform ceiling. The spec sheet also carries a practical footnote our rules box preserves: 768GB is the recommended maximum for performance-optimized configurations.
Spec sheet states 16 DDR4 DIMM slots supporting RDIMM/LRDIMM at speeds up to 2666 MT/s; lower grades are not enumerated, so only 2666-rated and faster modules are listed here.
Up to two 2nd Gen Intel Xeon Scalable; supports registered ECC DDR4 DIMMs only. Tower form factor.
Source: Dell official documentation
Not sure what to buy? Run the Memory Finder for this server - it turns these rules into priced, population-valid configurations.
Operating speed depends on CPU generation and DIMMs per channel — Spec sheet states 16 DDR4 DIMM slots supporting RDIMM/LRDIMM at speeds up to 2666 MT/s; lower grades are not enumerated, so only 2666-rated and faster modules are listed here.. Always verify against Dell's QVL for your exact configuration.
| Brand | Module | Capacity | Speed | Type | $/GB | Price | |
|---|---|---|---|---|---|---|---|
| Samsung | M393A8K40B22-CWD | 64GB | DDR4-2666 | RDIMM | $6.23 | $399.00 | Buy on Amazon |
| Supermicro | B07DFLTWN3 | 64GB | DDR4-2666 | LRDIMM | $6.23 | $399.00 | Buy on Amazon |
| A-Tech | B0BPN414ZJ | 64GB | DDR4-2666 | LRDIMM | $6.41 | $410.03 | Buy on Amazon |
| A-Tech | B0BPN4FLDX | 32GB | DDR4-2666 | RDIMM | $7.40 | $236.78 | Buy on Amazon |
| SK Hynix | HMA84GR7CJR4N-VK | 32GB | DDR4-2666 | RDIMM | $8.72 | $279.00 | Buy on Amazon |
| Samsung | M393A2K43CB2-CTD8Q | 16GB | DDR4-2666 | RDIMM | $8.75 | $139.99 | Buy on Amazon |
| A-Tech | B0BPN4L74H | 32GB | DDR4-2933 (runs at up to 2666 here) | RDIMM | $8.95 | $286.44 | Buy on Amazon |
| A-Tech | B0CGJFB4TG | 32GB | DDR4-2933 (runs at up to 2666 here) | RDIMM | $9.17 | $293.42 | Buy on Amazon |
| Samsung | M393A4K40CB2-CTD | 32GB | DDR4-2666 | RDIMM | $10.05 | $321.56 | Buy on Amazon |
| A-Tech | B0C2FML23M | 64GB | DDR4-2933 (runs at up to 2666 here) | RDIMM | $10.06 | $643.61 | Buy on Amazon |
| A-Tech | KTD-PE429 | 64GB | DDR4-2933 (runs at up to 2666 here) | RDIMM | $10.33 | $661.26 | Buy on Amazon |
| Kingston | KTD-PE426 | 32GB | DDR4-2666 | RDIMM | $10.94 | $349.99 | Buy on Amazon |
| Samsung | M393A2K43BB1-CTD6Q | 16GB | DDR4-2666 | RDIMM | $12.06 | $193.04 | Buy on Amazon |
| Samsung | M393A8G40AB2-CWE | 64GB | DDR4-3200 (runs at up to 2666 here) | RDIMM | $12.50 | $800.00 | Buy on Amazon |
| SK Hynix | HMAA8GR7AJR4N-XN | 64GB | DDR4-3200 (runs at up to 2666 here) | RDIMM | $13.52 | $865.00 | Buy on Amazon |
| A-Tech | MTA36ASF8G72PZ | 64GB | DDR4-3200 (runs at up to 2666 here) | RDIMM | $14.31 | $916.05 | Buy on Amazon |
| Samsung | M393A8G40BB4-CWE | 64GB | DDR4-3200 (runs at up to 2666 here) | RDIMM | out of stock | — | |
| Samsung | M393A2K43DB2-CTD6Y | 16GB | DDR4-2666 | RDIMM | out of stock | — |
Each scenario is priced from the cheapest compatible in-stock module at that capacity, at the timestamp above. Configurations never exceed the platform's 16 DIMM slots. Populate channels per the OEM rules below for full bandwidth.
Every row below is drawn from the same Dell document — nothing here is inferred from a sibling platform or a community source.
| Field | Documented value | Source |
|---|---|---|
| DIMM slots | 16 | Dell manual ↗ |
| Max system capacity | 1TB | Dell manual ↗ |
| Max per-DIMM capacity | not stated in the sourced documentation | Dell manual ↗ |
| Supported module classes | DDR4 RDIMM / LRDIMM | Dell manual ↗ |
| Supported speed range | 2666 MT/s | Dell manual ↗ |
| Documented DPC / speed step-down behavior | Spec sheet states 16 DDR4 DIMM slots supporting RDIMM/LRDIMM at speeds up to 2666 MT/s; lower grades are not enumerated, so only 2666-rated and faster modules are listed here. | Dell manual ↗ |
| Documented mixing / rank restrictions | Spec sheet notes 768GB max memory is recommended for performance-optimized configurations. | Dell manual ↗ |
| CPU-generation dependency | Up to two 2nd Gen Intel Xeon Scalable; supports registered ECC DDR4 DIMMs only. Tower form factor. | Dell manual ↗ |
Paraphrased from Dell's official documentation. Modules rated above the documented speed range are safe to install — a documented vendor behavior is that they run at the platform's supported speed for your DPC configuration rather than their own label speed, never at a speed we are claiming for them. See our population-rules and mixing-rules pages for how this platform's rules compare to others we've checked.
For the T440's usual buyer — one server, one upgrade, no procurement department — the playbook is short: count your empty slots, pick the 16GB or 32GB tier from the live table, buy in pairs, and match what is already installed if anything is. The platform's 2666 floor is our table's floor, so everything listed simply works; faster modules downclock without drama.
The spec sheet's own advice — 768GB recommended for performance-optimized configurations despite the 1TB ceiling — is worth honoring in the rare build that approaches it: towers at the capacity edge are running LRDIMM configurations the office environment never stresses evenly. Realistically, the T440 sweet spot is a fraction of that, and the scenarios above price it from today's listings.
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.
T440 owners are the small-office backbone: businesses whose entire infrastructure lives in one tower, and whose memory upgrade moment usually arrives with a hypervisor consolidation or an accounting-package version that doubled its requirements. For them the arithmetic is friendly — the platform's DDR4-2666 tier is deeply competed, and taking a T440 from 32GB to 128GB costs a few hundred dollars at live prices, not a few thousand.
The tower also has a homelab afterlife — quieter than any rack pull and tolerant of a closet — where the used-market guidance applies: tested 16GB and 32GB RDIMM pulls at this speed grade are among the cheapest server memory in existence, and the T440 accepts them gratefully.
Dell's documentation puts the platform maximum at 1TB across 16 DIMM slots. 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 2666 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: Spec sheet notes 768GB max memory is recommended for performance-optimized configurations. Mixed speeds, where allowed, run at the slowest module's speed — buying identical part numbers per channel remains the safe pattern.
Yes - a module rated above 2666 MT/s downclocks to 2666 and runs normally, which is why the table marks those rows "runs at up to 2666 here", while modules rated below 2666 MT/s are excluded because Dell does not list them as supported for the T440. That is Dell's own support matrix speaking, not a guess.
4× 64GB fills 256GB and leaves 12 of the 16 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.
The common consolidation target — domain services, file serving, one or two line-of-business VMs and a backup agent — sits comfortably in 64-128GB, a fraction of the platform's 1TB ceiling. Price 4× or 8× 16-32GB modules in the live table; the total is usually the cheapest meaningful upgrade the server will ever receive.