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Four green 288-pin DDR5 RDIMM modules in static bag

NEMIX RAM

NEMIX RAM RS720A-E12-RS12 256GB (4×64GB) DDR5 4800 CL40 ECC RDIMM memory upgrade

SKU CH-C1F9-CMPQ6 MPN RS720A-E12-RS12

256 GB DDR5 ECC registered server memory kit with four 64 GB modules at 4800 MT/s CL40 for ASUS RS720A-E12-RS12 systems

  • Total capacity256 GB (4 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 256 GB total capacity with four 64 GB modules
  • DDR5 4800 speed rated at PC5-38400 for server workloads
  • ECC registered RDIMM design protects data integrity
  • 1 V operating voltage reduces power draw
  • Validated for ASUS RS720A-E12-RS12 dual-processor server

Compatibility & Fit

This memory kit is built for the ASUS RS720A-E12-RS12 2U dual-processor server. It matches the platform's DDR5 4800 registered DIMM requirement and 288-pin form factor. IT teams managing that chassis can install the four 64 GB modules without configuration changes. Builders using different motherboards or desktop platforms should look elsewhere.

Capacity & Speed Decider

The kit delivers 256 GB total across four 64 GB modules running at DDR5 4800 with CL40 latency. That capacity and speed combination determines whether the server can handle the intended workload. If the application needs more memory or a different data rate, this kit will not meet the requirement.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $6,496.99
Pricier than about 82% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (4 × 64 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $25.38 per GB
Pricier than about 70% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineASUS Server Motherboard Compatible Series Memory
Model nameASUS DDR5 4800 MHz ECC RDIMM Registered Server Memory
Part numberMR38400-924K4
Total capacity256 GB (4 × 64 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank2Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsASUS
In the box
Included items256 GB (4 × 64 GB) DDR5 4800 MHz PC5-38400 2Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

Does the ASUS RS720A-E12-RS12 server require all 12 DIMM slots to be populated for this 256 GB kit to operate?

The kit contains four 64 GB registered DDR5 modules; the server will run with only these four installed, though maximum capacity needs all 12 slots filled.

Can I add these 2Rx4 CL40 modules alongside existing 1Rx4 or 2Rx8 RDIMMs in the same server?

Mixing ranks is supported by the platform, but all modules must share the same 4800 MT/s speed and 1.1 V voltage for stable operation.

How do I confirm the kit is running at DDR5 4800 with ECC active after installation?

Check the BIOS memory information screen — it should report 256 GB total, 4800 MT/s data rate, CL40 latency and ECC enabled for each module.

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