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Green rectangular DDR4 DIMM with black chips and gold contacts

SK hynix

SK hynix HMAA8GR7MJR4N-WM 64GB DDR4-2933 ECC Registered Quad Rank server RAM

SKU CH-Z0WV-63V4S

64 GB DDR4-2933 ECC registered quad-rank server memory with CL22 latency

  • Total capacity64 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL22
  • Buffer typeRegistered
  • Product type288-Pin DDR4 SDRAM
  • 64 GB capacity supports dense virtualisation workloads
  • DDR4-2933 speed delivers 23400 MB/s peak bandwidth
  • ECC registered design corrects single-bit errors automatically
  • Quad-rank organisation maximises density per DIMM slot
  • CL22 latency keeps timing tight for server stability

High-capacity server memory

The SK hynix HMAA8GR7MJR4N-WM is a 64GB DDR4-2933 registered DIMM with ECC and quad-rank organisation. It uses a 288-pin interface and operates at PC4-23400 speed with a CAS latency of CL22. This module is built for servers and workstations that require large memory footprints and data-integrity protection.

Thermals and power profile

Registered DDR4 modules run at standard DDR4 voltage and draw modest power under typical server workloads. The on-board register reduces electrical load on the memory controller, helping to keep temperatures stable in densely populated DIMM slots. ECC operation adds minimal overhead while correcting single-bit errors in real time.

Build integration notes

The quad-rank design means each module presents four logical ranks to the memory controller, so the platform must support that rank count per channel. Populating all channels with quad-rank DIMMs may limit the maximum supported speed on some platforms. No additional cooling hardware is required beyond standard server airflow.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $410.99
Pricier than about 67% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $6.42 per GB
Cheaper than about 59% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameSK hynix
Part numberHMAA8GR7MJR4N-WM
Total capacity64 GB
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL22
ECC supportYes
Buffer typeRegistered

Questions about this item

How do I install the 288-pin DDR4 module and what step is often missed?

Align the notch with the slot key, press firmly until both retention clips click, then verify the registered buffer is recognised in BIOS.

What maintenance or replacement will the quad-rank ECC DIMM need over its service life?

No scheduled maintenance is required; replace only if ECC logs report uncorrectable errors or the module fails POST.

At what point does the CL22 latency become the limiting factor under sustained workloads?

CL22 sets the minimum cycle delay; sustained throughput is capped by the 2933 MT/s data rate before latency dominates.

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