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Green rectangular DDR4 memory module with gold edge connector and black heat spreader

SK hynix

SK hynix HMAA8GR7MJR4N-XN 64GB DDR4-3200 ECC Reg CL22 Dual Rank Server RAM

SKU CH-25HE-7T1R7

64 GB DDR4-3200 ECC registered dual-rank module with CL22 latency for server workloads

  • Total capacity64 GB
  • CAS latencyCL22
  • Buffer typeRegistered
  • Memory rankDual Rank
  • 64GB capacity supports dense virtualisation workloads
  • DDR4-3200 speed delivers 25600 MT/s data rate
  • ECC registered design corrects single-bit errors automatically
  • Dual-rank organisation increases memory density per slot
  • CL22 latency balances timing with high-frequency stability

64GB DDR4-3200 ECC Registered DIMM

This 64GB module uses DDR4 technology at 3200MHz with CL22 latency. It includes error-correcting code and registered signalling for data integrity. The dual-rank layout fills a single slot with high density. It is built for servers and workstations that require maximum reliability.

Registered design eases electrical load

The registered buffer reduces the signal load seen by the motherboard, allowing larger memory populations per channel. ECC detects and corrects single-bit errors without halting the system. Dual-rank organisation provides two logical ranks per DIMM for bandwidth efficiency. The PC4-25600 rating confirms the 3200MHz transfer rate.

Suited for capacity-hungry server builds needing

Buyers who need non-ECC unbuffered memory for consumer platforms should look elsewhere. Systems limited to single-rank modules per channel may not support this density. Workloads requiring speeds beyond 3200MHz will need faster-rated memory.

How it compares

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

Price $622.99
Pricier than about 73% 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 $9.73 per GB
Pricier than about 66% of the 6,064 comparable items (median $7.25 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameHynix
Part numberHMAA8GR7MJR4N-XN
Total capacity64 GB
Memory
CAS latencyCL22
ECC supportYes
Buffer typeRegistered
Memory rankDual Rank

Questions about this item

Will the CL22 latency become a bottleneck during sustained heavy workloads?

CAS latency of 22 cycles is fixed by the JEDEC DDR4-3200 specification; the module will not throttle or change timing under continuous load.

What thermal or power behaviour should I expect when this registered DIMM runs continuously?

Registered DDR4 DIMMs draw modest power and run cool enough for standard server airflow; no active cooling on the module itself is required.

What motherboard features must my system already provide for this 64 GB stick to function?

The board needs DDR4 RDIMM slots, ECC support in the chipset and BIOS, and a memory controller qualified for dual-rank registered modules.

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