Server Memory
Server Memory covers ECC modules for rack, tower and blade servers from DDR3 through DDR5. Older PowerEdge and ProLiant systems take DDR3 registered DIMMs such as Nanya's 8GB PC3-10600 and Dell's GNF74. DDR4 RDIMMs and 128GB and 256GB LRDIMMs come from Samsung, SK Hynix and Micron as well as HPE SmartMemory kits, and DDR5-4800 RDIMMs serve current platforms. Intel Optane persistent memory (DCPMM) is listed too. The server decides the DDR generation, module type and rank, so look those up before comparing capacity or price.
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Server Memory: 15,955 products
Buying guide
Choosing server memory
DDR generation
Dell 11th and 12th generation PowerEdge and HPE ProLiant G7 and Gen8 servers take DDR3. Dell 13th and 14th generation and HPE Gen9 and Gen10 take DDR4.
Module type
Registered (RDIMM), load-reduced (LRDIMM) and unbuffered (UDIMM) modules are not mixed in one server. Use the type your server's documentation lists.
Rank and organization
Labels such as 2Rx4 or 1Rx8 give the rank count and chip width. Ranks per channel limit how many modules a channel takes and the speed they run at, so fill channels with identical modules.
Speed
A module runs at the speed the processor and memory population allow, so a faster rating than the server supports is fine. Mixed speeds run at the slowest module's speed.
OEM part numbers
HPE sells memory under an option-kit number ending in -B21 and services it under a separate spare-part number, so the number on a module can differ from the one on its box. Dell uses SNP and DPN numbers.
Server Memory
Frequently asked questions
What is DCPMM memory?
Intel Optane DC Persistent Memory: modules in DIMM format that keep their data through a power loss and come in larger capacities than DRAM. They work only with supported 2nd and 3rd generation Intel Xeon Scalable processors and always alongside regular DRAM DIMMs.
Will registered server memory work in a desktop PC?
Usually not. Registered and load-reduced DIMMs need a platform built for them, such as a Xeon, EPYC or Threadripper Pro board. Most desktop motherboards accept only unbuffered modules.
Does the slot I use matter?
Yes. For full bandwidth, populate every memory channel evenly, in the slot order the server's documentation gives, and in a two-socket server split the memory equally between the processors. An unbalanced layout still boots but runs slower.
