SK Hynix 32GB DDR4-2933 ECC RDIMM Server Memory

HMAA4GR7AJR4N-WM is SK Hynix's part number for a 32GB DDR4 registered ECC DIMM. The -WM suffix denotes DDR4-2933 operation with 21-21-21 timings, which corresponds to the PC4-2933Y designation on the label. The module is single rank with x4 DRAM organisation and uses 16Gb DRAM devices. Matching this exact part number is the simplest way to keep a server's memory configuration consistent.

Both are 32GB single-rank 1Rx4 DDR4 RDIMMs built on 16Gb DRAM, but they are rated at different speeds. The -XN version is rated at DDR4-3200, while this -WM module is rated at DDR4-2933. On 2nd Gen Intel Xeon Scalable servers, whose maximum memory speed is 2933MT/s, the two would typically operate at the same speed.

DDR4-2933 registered ECC modules of this specification are used in Dell PowerEdge 14th generation servers such as the R740 and in HPE ProLiant Gen10 servers such as the DL380 Gen10. These servers run 2933MT/s memory when fitted with 2nd Gen Xeon Scalable processors. Check your system's memory guide and BIOS level, particularly for support of 16Gb-based RDIMMs, before ordering.

Most server platforms allow mixing ranks and speeds within the same module type, with some restrictions. Mixed-speed DIMMs generally run at the speed of the slowest installed module, and many vendors recommend identical modules within each channel for best performance. You should never mix RDIMMs with LRDIMMs or unbuffered DIMMs. Consult your server's population rules before combining different modules.

Generally, no. This is a registered ECC DIMM, and standard consumer desktop motherboards accept only unbuffered memory. They will typically fail to boot with an RDIMM installed. The module is intended for server and workstation platforms whose memory controllers support registered DDR4. That includes Intel Xeon Scalable systems and other platforms that explicitly list RDIMM support.

A single-rank 1Rx4 module puts less electrical load on the memory channel than a dual-rank module of the same capacity. On platforms that limit total ranks per channel, or that reduce speed as more ranks are added, this makes it easier to populate more slots at full speed. Some workloads gain slightly from the rank interleaving that dual-rank modules provide, so the best choice depends on your platform.

The module uses the standard 288-pin DDR4 DIMM form factor and operates at the JEDEC DDR4 standard voltage of 1.2V. It is notched for DDR4 slots only. It will not physically fit DDR3 or DDR5 sockets, which use different pin counts and key positions.

Off-lease or decommissioned enterprise hardware that we clean, test and reset in Doha. Every unit goes through POST, burn-in, memory and drive checks and a power-supply check, with firmware and BIOS returned to defaults and drives securely erased.

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A 6-month hardware warranty from the delivery date, covering the unit as supplied. If a part fails we repair or replace it. Full terms are on the warranty page.

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