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ECC Server RAM: Registered, Unbuffered and LRDIMM

Error-correcting DDR3, DDR4 and DDR5 memory modules for servers and workstations, in registered, unbuffered and load-reduced types. 6,523 products from $7.99 to $73,487.99. A-Tech, Brute Networks, NEMIX RAM and more.

6,523 products from $7.99

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Registered, unbuffered or load-reduced: what the board accepts

Server memory is not interchangeable across buffer types. Registered modules (RDIMM) place a register chip between the controller and the DRAM so a board can carry many modules. Unbuffered ECC modules (UDIMM) skip that chip and suit entry-level servers and workstation boards. Load-reduced modules (LRDIMM) also buffer the data lines, which allows the highest capacity per slot. Boards built for unbuffered modules take no other type, many registered boards also accept LRDIMMs, and mixing types in one system is unsupported, so read the board or system manual before choosing.

The memory generation must match as well. DDR3, DDR4 and DDR5 use different notches and voltages, from 1.5 V or 1.35 V on DDR3 down to 1.2 V on DDR4 and 1.1 V on DDR5, so a module cannot seat in another generation's slot. The rated speed, such as DDR4 3200 or DDR5 4800, is a ceiling: the processor's memory controller and the number of modules per channel set the speed the module actually runs, and mixed speeds fall back to the slowest.

Ranks, capacity and speed when you fill the slots

Rank labels such as 1Rx4, 2Rx8 or 4Rx4 tell you how many sets of chips share the module and how wide each chip is. Server platforms publish the ranks and capacity they support per channel, and loading many high-rank modules can force the memory clock down. Fill channels evenly with identical modules for the best bandwidth. When extending an existing server, copy the module part number or the exact specification from the vendor's qualified memory list rather than matching capacity alone.

Questions about ECC Server RAM: Registered, Unbuffered and LRDIMM

Can I use ECC memory in a regular desktop?
Error correction works only if both the processor and the motherboard support ECC. Many consumer boards accept ECC unbuffered modules but run them without error correction, and registered modules will not work at all in a board built for unbuffered memory. Check the board's memory support list first.
Can I mix different sizes or speeds of server RAM?
Sometimes, but it is risky. Mixed modules run at the speed of the slowest one, and many servers want identical modules in each channel for full bandwidth. Mixing registered with unbuffered modules, or different generations, is not supported at all.
What does a rank label like 2Rx4 tell me?
The first number is how many ranks, which are groups of chips addressed together, sit on the module, and the last number is the data width of each chip. Server manuals limit the total ranks per channel, so the label decides how many modules you can fit.