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Green rectangular DDR4 RDIMM module with gold 288-pin edge connector and black memory chips on both sides

SK hynix

SK hynix HMAA8GR7MJR4N-XN 64GB DDR4-3200 ECC Registered RDIMM server RAM

SKU CH-7M5Q-5M38B

Provides 64 GB of DDR4 server memory at 3200 MHz with ECC and registered 288-pin design

  • Capacity64GB
  • Type288-Pin DDR4 SDRAM
  • SpeedDDR4 3200 (PC4 25600)
  • Voltage1.20V
  • ECCYes
  • Buffered/RegisteredRegistered
  • High-capacity 64GB module supports demanding server workloads
  • DDR4-3200 speed delivers 25600 MT/s data throughput
  • ECC registered design detects and corrects memory errors
  • Low 1.20V voltage reduces power draw per module
  • 288-pin RDIMM form factor fits standard server slots

64GB DDR4-3200 ECC Registered RDIMM

This SK hynix server memory module delivers 64GB of DDR4 capacity at 3200 MT/s with a PC4-25600 rating. It operates at 1.20V and uses a 288-pin RDIMM form factor with a 2Rx4 rank configuration. Error-correcting code and registered buffering are built in for data integrity in multi-socket platforms.

Suited for servers needing high-density registered

This module fits systems that require registered DDR4 RDIMMs with ECC for stability under sustained workloads. It is not intended for desktop or consumer motherboards that accept only unbuffered UDIMMs. Buyers who need non-ECC or unregistered memory should look at a different product class.

Installs in a 288-pin DDR4 RDIMM slot at 1.20V

The registered design reduces electrical load on the memory controller, allowing higher total system capacity when paired with compatible server chipsets. ECC functionality corrects single-bit errors to maintain uptime. Ensure the platform supports DDR4-3200 registered RDIMMs before installation.

Highlights

  • High-capacity 64GB module supports demanding server workloads
  • DDR4-3200 speed delivers 25600 MT/s data throughput
  • ECC registered design detects and corrects memory errors
  • Low 1.20V voltage reduces power draw per module
  • 288-pin RDIMM form factor fits standard server slots

Specifications

BrandSK hynix
ModelHMAA8GR7MJR4N-XN
Capacity64GB
Type288-Pin DDR4 SDRAM
SpeedDDR4 3200 (PC4 25600)
Voltage1.20V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
ChipsetMajor Brand Chipset

Questions about this item

My server board has 288-pin DDR4 slots — will this RDIMM fit and run at 1.2V?

Yes, the module uses the standard 288-pin DDR4 form factor and operates at 1.2V, matching the slot specification for registered DIMMs.

I plan to keep some older registered DDR4 RDIMMs installed alongside this one — will the system still boot with mixed ranks?

The module is a 2Rx4 registered DIMM; most server platforms require all populated slots to run at the same speed and rank configuration, so check your board’s memory population rules before mixing.

After installation, how can I confirm the 64GB module is running at DDR4-3200 with ECC active?

Enter the BIOS or use a tool like dmidecode to verify the reported speed shows 3200 MT/s, the capacity reads 64GB, and ECC status is enabled.

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