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Green rectangular DDR4 server memory module with gold contacts and black chips on both sides

SK hynix

SK hynix HMAA8GR7AJR4N-WM 64GB DDR4-2933 ECC Registered Dual Rank server RAM

SKU CH-SMQS-DP0C6

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

  • Total capacity64 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL22
  • Buffer typeRegistered
  • Product type288-Pin DDR4 SDRAM
  • 64 GB capacity supports memory-intensive server workloads
  • DDR4-2933 speed delivers 23400 MT/s data transfer rate
  • ECC Registered design detects and corrects single-bit errors
  • Dual Rank architecture increases memory density per channel
  • 288-pin DDR4 form factor fits standard server DIMM slots

64GB DDR4-2933 ECC Registered module

This 64GB DDR4-2933 ECC Registered module is built for servers and workstations that require high-capacity, error-correcting memory. It operates at 2933MHz with a CAS latency of 22. The dual-rank design helps maximise density per slot. It is sold new as a single 288-pin DIMM.

Registered ECC with dual-rank organisation

The registered buffer and ECC functionality are the decisive specifications for compatibility. This module uses a registered signal to reduce electrical load on the memory controller, and ECC to detect and correct single-bit errors. Both features must be supported by the platform; consumer desktop boards typically cannot use this memory.

Fits 288-pin DDR4 slots on qualified platforms

Installation requires a 288-pin DDR4 slot on a motherboard and processor combination that explicitly supports registered ECC DIMMs and dual-rank modules at this capacity. The registered design frees the memory controller from driving heavy capacitive loads. Buyers needing unbuffered non-ECC memory or higher speeds must select a different module type.

How it compares

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

Price $426.99
Pricier than about 68% 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 $6.67 per GB
Cheaper than about 57% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameHynix
Part numberHMAA8GR7AJR4N-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

What does the 2933 MHz speed mean for actual throughput in a server?

The module runs at 2933 MT/s, delivering up to 23400 MB/s theoretical bandwidth per stick; real-world throughput depends on the platform's memory controller and channel population.

How does the registered DDR4 interface affect usable speed?

The registered design adds a clock cycle of buffering for signal integrity, allowing the 2933 MT/s rate to scale across large memory arrays without exceeding the DDR4 electrical limits.

Will the 288-pin dual-rank module fit my server's DIMM slots?

It uses the standard 288-pin DDR4 RDIMM form factor with dual-rank organisation, so it fits any server board that accepts registered DDR4 DIMMs of this height.

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