Cheapest 32GB server RAM ranked by price per GB

32GB server RAM: the most common module in used DDR4 servers

32GB is the module that most DDR4 servers and workstations were filled with, and the size the used market has in the greatest volume. It is also a mainstream DDR5 RDIMM for current platforms. The 100 32GB server and workstation modules above are ranked by price per gigabyte, from £2.01/GB to £52.10/GB with a median of £9.85/GB; the cheapest right now is OFFTEK 32GB Replacement Memory RAM Upgrade for Dell PowerEdge R720 (DD… at £64.28.

Which platforms use 32GB modules

• DDR4 RDIMM (typically 2Rx4, PC4-2400T to PC4-3200AA): Xeon E5 v3 and v4, Xeon Scalable first to third generation, and EPYC 7001 to 7003, covering servers such as the Dell PowerEdge R630 to R750 and HP ProLiant Gen9 and Gen10.
• Workstations on DDR4 RDIMM: Threadripper PRO on WRX80 boards, Xeon W-2100 and W-2200, and the 2019 Mac Pro, which takes DDR4-2933 ECC RDIMMs in twelve slots; see the Mac page.
• DDR4 ECC UDIMM: Xeon E-2200 and Ryzen ECC builds, where 32GB per slot is often the largest the board accepts.
• DDR5 RDIMM: Xeon Scalable 4th generation onward, EPYC 9004 and 9005, Xeon W-2400 and W-3400 and Threadripper 7000. DDR5 RDIMMs are keyed differently from DDR4 ones, and 32GB DDR5 ECC UDIMMs suit AM5 and W680 boards with ECC support.
• DDR3 LRDIMM (4Rx4 PC3L-10600L and similar): the way to reach very large totals on Xeon E5 v1 and v2 servers. LRDIMMs cannot be mixed with RDIMMs.

Gotchas specific to 32GB modules

Speed is set by the slowest of three things: the module, the CPU and the number of DIMMs per channel. A PC4-2933Y module in a Xeon E5 v4 server runs at 2400, and filling two DIMMs per channel on many Xeon Scalable boards drops the speed a step. Buying faster stock than the server can use is harmless, and often costs nothing extra on the used market, but there is no point paying a premium for it. Match the rank of what is already installed; mixing 2Rx4 and 1Rx4 modules in the same channel is a common cause of boot errors on Dell and HPE machines. And a single 32GB stick is not the right buy for a desktop: RDIMMs will not run on consumer boards, whatever the generation. For a desktop the 32GB desktop page and 64GB desktop page are the place to look.

How many to buy

Fill channels evenly: sets of four per socket on Xeon E5, six on first to third generation Xeon Scalable, and eight on EPYC 7002 and 7003. Twelve 32GB RDIMMs in a two-socket Xeon Scalable server gives 384GB with one DIMM per channel and full speed, a common home-lab target. If you are going larger than that, compare the per-GB price of 64GB modules on the 128GB and capacity pages before doubling up on 32GB sticks.

Reading the table

The ECC and Buffered columns separate RDIMMs, LRDIMMs and ECC UDIMMs, and the title usually carries the full PC4 code and rank. Most stock here is used or refurbished; memory with ECC reports its own faults, and a module that passes a test is a low-risk buy, as the Warehouse RAM guide explains. Compare with the 16GB server page, the ECC RAM page for workstation use, and the server and 32GB hubs.