64GB Server RAM (ECC)

64GB memory modules are the workhorse DIMM for modern virtualization and database hosts — one 64GB RDIMM or LRDIMM fills a channel without the per-module premium of 128GB parts, so most ProLiant, PowerEdge and Supermicro builds reach their target capacity on 64GB sticks. Every module here is sold by exact manufacturer part number and JEDEC spec: DDR4 and DDR5, ECC Registered (RDIMM) and Load-Reduced (LRDIMM), across the common 2933 / 3200 / 4800 MT/s speeds, from Micron, Samsung, SK Hynix and the HPE and Dell OEM-serialized equivalents your server's iLO or iDRAC expects. We show New and Refurbished stock together so you can compare a factory module against a tested pull for the same slot. Server memory is unforgiving about rank, voltage and OEM keying, so match your platform's population rules before you order — or use the bulk-quote link on any module and we'll confirm the part against your exact server model. In stock, fast US shipping, warranty-backed, and purchase orders welcome.

RDIMM, LRDIMM or UDIMM: which DIMM type do you need?

Server memory comes in three buffered/unbuffered designs. A server accepts only the type its population rules list, and RDIMM and LRDIMM can never be mixed in one system.

RDIMM (Registered): A register buffers the address and command lines, so the memory controller sees one load per DIMM. The standard choice for most 16GB-64GB modules in ProLiant, PowerEdge, ThinkSystem and Supermicro servers.
LRDIMM (Load-Reduced): Buffers the data lines as well, which lets a channel carry more, larger modules at full speed. Used for 64GB-512GB high-density builds where total capacity matters more than per-module cost.
UDIMM / ECC UDIMM (Unbuffered): No register - the controller drives the chips directly. Found in entry servers, workstations and micro-servers (Xeon E, some AMD platforms) with two DIMMs per channel at most. Not interchangeable with RDIMM.

Compatibility notes before you order

Match the generation your platform takes: DDR4-2666/2933 for 1st/2nd-gen Xeon Scalable and EPYC 7001/7002, DDR4-3200 for 3rd-gen Xeon Scalable and EPYC 7003, DDR5-4800/5600 for 4th/5th-gen Xeon Scalable and EPYC 9004/9005. A DDR4 module does not fit a DDR5 slot.
Never mix RDIMM and LRDIMM in the same server. Mixed ranks or speeds usually work but run at the slowest common speed - for a full population buy a matched set.
HPE (P-number) and Dell (SNP/A-number) OEM-serialized modules are flagged for iLO / iDRAC. They run in a Supermicro or Lenovo board, but the management controller may log a warning; the JEDEC-standard Micron, Samsung or SK Hynix equivalent avoids that.
Fill channels evenly, following the population order in your server's manual, and confirm the maximum module size per slot for your CPU generation (for example, 64GB RDIMMs are not supported on every Gen9 / 13G platform).
Unsure? Use the bulk-quote link on any module with your exact server model and we confirm the part before you pay.

New vs Recertified vs Refurbished

Every part is sold by exact manufacturer part number and ships warranty-backed. Here's what each condition means so you can weigh price against your workload.

New: Factory-sealed and unused, with the full manufacturer warranty. The safest choice for a fresh build or a warranty-sensitive deployment.
Recertified: OEM-recertified and restored to original specification, typically with low power-on hours. Health-tested and backed by our own replacement warranty — the same usable capacity for a lower price.
Refurbished: Professionally tested working pulls, wiped and inspected. A cost-effective option for labs, cold storage and non-critical tiers, warranty-backed.

Not sure which to pick? Read our New vs Recertified vs Refurbished guide.

Frequently asked questions

What's the difference between RDIMM and LRDIMM at 64GB?+

RDIMM (Registered) buffers the address/command lines and is the common choice for most 64GB modules. LRDIMM (Load-Reduced) buffers the data lines too, allowing higher total capacity per channel on platforms that support it. Match whichever your server's population rules specify.

Will HPE or Dell OEM memory work in a Supermicro or generic board?+

OEM-serialized modules are keyed and firmware-flagged for their platform's management (iLO/iDRAC) and may warn elsewhere. For a non-OEM board, choose the matching JEDEC-standard module — or send your server model via the bulk-quote link and we'll pick the compatible part.

Can I mix New and Refurbished 64GB modules?+

For best stability, populate a server with matched rank, speed and manufacturer across a channel. Mixing within spec is often fine, but for a full set we recommend a matched batch — use the bulk-quote link and we'll assemble one.

Do you accept purchase orders?+

Yes — POs are welcome and we ship fast from the US. For volume or a matched kit, use the bulk-quote link on any module for pricing and a compatibility check.

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64GB Server RAM (ECC)

RDIMM, LRDIMM or UDIMM: which DIMM type do you need?

Compatibility notes before you order

New vs Recertified vs Refurbished

Frequently asked questions

Related collections

64GB Server RAM (ECC)

RDIMM, LRDIMM or UDIMM: which DIMM type do you need?

Compatibility notes before you order

New vs Recertified vs Refurbished

Frequently asked questions

Related collections