The X11SPL-F is a homelab legend for a reason: a single-socket LGA-3647 board that takes cheap first- and second-gen Xeon Scalable CPUs, eight DDR4 DIMM slots, IPMI, and a price on the used market that embarrasses everything newer. Its memory story is equally friendly — registered ECC DDR4 from 2133 through 2933 MT/s, the exact segment of the market where the 2026 shortage is at its mildest and where tested pulls are abundant.
The rules box below carries what Supermicro's board page states: eight slots, up to 2TB, RDIMM and LRDIMM support including 3DS variants. Note the BIOS dependency the board page flags — 2nd-gen Xeon Scalable (and with it 2933 MT/s operation) requires BIOS 3.0a or later — worth checking before buying faster modules for an older board.
Board page lists 2933/2666/2400/2133 MT/s ECC DDR4 LRDIMM (3DS) and RDIMM (3DS).
Single Socket LGA-3647 (Socket P); Intel Xeon Scalable and 2nd Gen Xeon Scalable (BIOS 3.0a+ required for 2nd Gen); up to 165W TDP.
Operating speed depends on CPU generation and DIMMs per channel — Board page lists 2933/2666/2400/2133 MT/s ECC DDR4 LRDIMM (3DS) and RDIMM (3DS).. Always verify against Supermicro'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 | M393A2G40DB0-CPB | 16GB | DDR4-2133 | RDIMM | $4.53 | $72.48 | Buy → |
| Samsung | M393A4K40CB1-CRC | 32GB | DDR4-2400 | RDIMM | $4.84 | $154.94 | Buy → |
| SK Hynix | HMAA8GL7MMR4N | 64GB | DDR4-2400 | RDIMM | $4.92 | $314.95 | Buy → |
| A-Tech | B0BPN4FLDX | 32GB | DDR4-2666 | RDIMM | $5.02 | $160.53 | Buy → |
| Micron | MTA36ASF4G72PZ | 32GB | DDR4-2666 | RDIMM | $5.47 | $175.00 | Buy → |
| A-Tech | B083Q3F5DX | 32GB | DDR4-2400 | RDIMM | $5.69 | $182.12 | Buy → |
| Samsung | M393A2G40EB1-CPB | 16GB | DDR4-2133 | RDIMM | $5.76 | $92.18 | 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 → |
| Kingston | KSM24RD4/32MEI | 32GB | DDR4-2400 | RDIMM | $9.22 | $295.10 | 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 → |
| Crucial | B017UGKB32 | 16GB | DDR4-2400 | RDIMM | $11.25 | $179.99 | 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 8 DIMM slots.
Speed behavior on this platform: Board page lists 2933/2666/2400/2133 MT/s ECC DDR4 LRDIMM (3DS) and RDIMM (3DS). 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 Supermicro's official documentation. Anything the manual does not state is omitted here rather than guessed.
Build memory for the X11SPL-F the way its buyers build everything: incrementally and cheaply. Four modules feed the board's channels well enough to start; the remaining slots absorb growth as the homelab's ambitions do. The full 2133-2933 range qualifies per the board page, which puts the used market's cheapest registered DDR4 squarely on the menu — check the BIOS revision only if pairing with 2nd-gen silicon and its 2933 grade.
The board's 2TB ceiling is theoretical comfort rather than practical target: real X11SPL-F builds live between 64GB and 256GB, where used 32GB RDIMMs rule on price. Buy matched, test on arrival, and spend the savings on the drives this board was probably bought to serve.
Every specification in the rules box above was verified against the Supermicro 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 Supermicro'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: Supermicro 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.
This board's buyers are overwhelmingly builders: homelab operators assembling storage servers, Proxmox hosts, and TrueNAS boxes around cheap Scalable silicon. For them the eight slots are the growth path — start with four modules for quad-channel-ish bandwidth on a budget, add four more when the VMs demand it. The used DDR4 RDIMM market is this build's natural supplier, and the refurb guidance on our DDR4 pages applies without an asterisk.
The X11SPL-F also shows up in small-business roles — a quiet tower server running a domain, a backup target, a self-hosted app stack — where its buyer wants one honest number: what does it cost to get to 128GB or 256GB today. The upgrade scenarios above compute exactly that from live listings, and at DDR4 prices the answer is usually pleasant.
Supermicro's documentation puts the platform maximum at 2TB across 8 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 2133 to 2933 MT/s, per Supermicro'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.
The Supermicro documentation we verified does not spell out mixing rules for this platform, so treat identical modules per channel as the rule: mixed configurations at best run at the slowest common speed, and at worst fail population requirements. Check the platform manual for your exact loadout before mixing.
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 2133 MT/s are excluded from the table because Supermicro does not list them as supported.
8× 64GB fills 512GB, using all 8 slots. 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.
No. It takes standard DDR4 ECC RDIMMs and LRDIMMs from any manufacturer — Samsung, SK Hynix, Micron and Kingston parts all serve, and Supermicro publishes a tested-memory list if you want belt-and-suspenders. The live table above is sorted by $/GB across all of them.