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Board-matched memory for ASRock and ASRock Rack — boards covered, spanning server, workstation and desktop platforms.

ASRock Rack server and workstation boards run on AMD EPYC Turin, Genoa and ROMED and Intel W680, W790 and C621 Xeon platforms. These take ECC RDIMM (45 listings), LRDIMM for the highest-capacity builds, or ECC UDIMM on the entry boards — and which one depends on the specific board, not the chipset family.

ASRock consumer and prosumer boards — X870, B850, B650, Z790, X570 — take non-ECC UDIMM, with SODIMM for the small form factor systems.

DDR5 running 4800 through 6400MHz, with DDR4 held for the ROMED and X570-era boards still in service. Densities run 8GB to 256GB per module.

Module type matters more on ASRock than most brands because the range covers five of them. An ASRock Rack board expecting registered memory will not post with unbuffered; a W680 board wanting ECC UDIMM will not take RDIMM. Use Shop by System Model to filter to your exact board and see only modules that fit it, or send us the board model and we'll confirm it before you order.

Lifetime warranty on every module. Purchase orders, net terms and volume pricing for business, government and education buyers.

Memory by ASRock board family

ASRock's model names encode the platform, and the platform decides the module type. Read the board name against the table, then confirm on the board's spec page — the same chipset can appear on a UDIMM board and an RDIMM board.

Board lists are representative. The board's spec page and memory QVL are the authority; use Shop by System Model to filter to your board.

The 60-second module-type check

Before ordering anything for an ASRock board, answer three questions from the board name or spec page. Socket: SP5, SP3, SP6, LGA 4677, LGA 4189, sWRX9, sWRX8, and sTR5 are registered-memory sockets — RDIMM (or LRDIMM on DDR4). LGA 1700, LGA 1851, LGA 1200, AM5, and AM4 are unbuffered — UDIMM. ECC: ASRock Rack boards on unbuffered sockets (W680, C256, C246, B650D4U, X570D4U) take ECC UDIMM; ASRock consumer boards on the same sockets take non-ECC. Form factor: DeskMini, 4X4 BOX, NUC BOX, and some industrial boards take SODIMM; everything else is full-size. Get those three right and the rest is capacity and speed.

How to identify what is installed

1. ASRock Rack BMC: the IPMI web interface (ASPEED-based on every ASRock Rack board) → Dashboard → System Inventory → Memory lists every slot with capacity, speed, rank, manufacturer, and part number. No downtime required.
2. From the OS: sudo dmidecode -t baseboard and dmidecode -t memory on Linux, or wmic baseboard get product and Task Manager → Performance → Memory on Windows, give the board model and per-slot population on boards without a BMC.
3. UEFI setup: the Advanced / DRAM Information page shows installed modules by slot on consumer and workstation boards.
4. On the board: the model is silk-screened near the DIMM slots or between the PCIe slots.

Population rules that matter on ASRock

• Registered and unbuffered never mix, and never cross. An RDIMM in a W680 or AM5 board will not post; a UDIMM in a GENOA or WRX90 board will not post. The board dictates the type; there is no BIOS setting that changes it.
• Fill channels before doubling up. EPYC 9004/9005 has 12 channels, Xeon Scalable 8, Threadripper PRO 8, Ryzen and Core 2. One DIMM per channel first, in the order the manual gives (ASRock Rack: A1 → B1 → C1 …; consumer boards: A2 / B2 first). A single 64GB module in a 12-channel GENOA socket runs at one-twelfth of available bandwidth.
• Four DIMMs on AM5 and LGA 1700/1851 costs speed. Two-channel platforms run their rated DDR5 speed with two modules; four modules typically train at a lower speed (3600–4400 on early AM5 BIOS, better on current releases). If you need 128GB on a consumer board, 2×48GB or 2×64GB at full speed usually beats 4×32GB at reduced speed.
• Match capacity, speed, and rank across the board. Mixed speeds run at the slowest module; mixed ranks on server boards can force a lower speed or drop supported DIMMs per channel. Identical modules across the board are the safe configuration, which is why we sell matched kits sized to the channel count.
• The CPU sets the ceiling. A GENOA board accepts 6000 modules; an EPYC 9004 runs them at 4800. A W790 board accepts 5600; a Xeon W-2400 has four channels, not eight. Check the processor before paying for the faster grade.
• ECC on Ryzen depends on the CPU and board. ASRock Rack AM4/AM5 boards support ECC UDIMM with Ryzen PRO, EPYC 4004, and most standard Ryzen desktop CPUs; ECC reporting is enabled in the board's UEFI. ASRock consumer boards on the same sockets do not enable ECC. Check the QVL for your processor before choosing ECC.
• EXPO and XMP profiles are irrelevant on server and workstation boards. ASRock Rack, W790, WRX80, WRX90, and TRX50 run memory at its JEDEC rated speed. Buy the JEDEC speed the board and CPU support; overclocking profiles are a consumer-board feature.

Workstation boards: W680, W790, WRX80, WRX90, TRX50

These are where module-type mistakes are most common because they look like consumer boards and are bought by the same people. W680 (W680D4U and its variants) is an unbuffered ECC platform for 12th–14th Gen Core and Xeon E-2400 — ECC UDIMM, DDR4-3200, four slots, and a good fit for a quiet ECC workstation or a small Proxmox host. W790 is a registered platform for Xeon W-3400/W-2400 — DDR5-4800 RDIMM, eight slots, and a W-2400 uses four channels. WRX80 and WRX90 are the Threadripper PRO platforms — eight-channel RDIMM (DDR4-3200 and DDR5-5200 respectively), and they want all eight channels populated to deliver the bandwidth the platform is bought for. TRX50 is non-PRO Threadripper 7000 — DDR5-5200 RDIMM on four channels. None of these accept a desktop UDIMM.

What "compatible equivalent" means here

A NEMIX RAM module listed for an ASRock board matches the board's qualified spec on every attribute the memory controller checks: DDR generation, capacity, ECC status, buffering (registered, load-reduced, or unbuffered), rated JEDEC speed, rank organization, voltage, and pin count. It is built on DRAM from the manufacturers on ASRock's QVL and tested in the board family before listing. ASRock boards do not check for a memory brand; the BMC or UEFI reports the module's manufacturer and runs it at spec. Mixing NEMIX RAM with other modules of the same spec is supported. Every module carries a lifetime replacement warranty with free US-based technical support.

Fleet, government, and education purchasing

NEMIX RAM is a registered federal supplier (UEI GV8MMYNDJ5J1, CAGE 59AB2) and accepts purchase orders with net terms for business, government, and education buyers. For multi-node ASRock Rack builds, send the board model and node count, or a BOM, and we return a matched set sized to the channel count and shipped together. Volume and reseller pricing is available on request.

Frequently asked

My board isn't on the QVL for this module. ASRock's QVL is a list of modules it happened to test, not an exclusion list; it is rarely complete for any board. The NEMIX RAM module matches the spec of QVL parts for that board and is tested in the board family, and the lifetime warranty covers it.

ROMED8-2T: RDIMM or LRDIMM? RDIMM unless you need the capacity ceiling — LRDIMM exists to reach 2TB on the eight slots with 256GB modules. If the board already has one type, that decides it.

Can I put ECC UDIMM in an ASRock consumer X870 or Z890 board? It will usually post and run as non-ECC; the ECC function is not enabled on consumer boards. Buy the non-ECC module and save the difference, or buy an ASRock Rack board if ECC is the point.

Z890: UDIMM or CUDIMM? Both work; CUDIMM is required only to reach the high overclocked speeds Core Ultra 200S supports. At JEDEC 6400 a standard UDIMM is fine.

Can I go faster than the board's rated speed? On server and workstation boards, no — memory runs at the JEDEC speed the CPU supports. On consumer boards, higher speeds require an EXPO/XMP profile and are not guaranteed; the JEDEC speed listed here is what the board is qualified for.

UEI Approved Supplier: GV8MMYNDJ5J1 CAGE CODE: 59AB2

NEMIX RAM can deliver any Configuration your Fleet Requires

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