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Four green DDR5 RDIMM modules in anti-static tray

NEMIX RAM

NEMIX RAM RS520A-E12-RS24U 256GB (4x64GB) DDR5 4800 CL40 ECC RDIMM memory upgrade

SKU CH-NWWS-90KRC MPN RS520A-E12-RS24U

256GB DDR5 ECC registered server memory kit with four 64GB modules at 4800MHz CL40 for ASUS RS520A-E12-RS24U

  • 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 across four 64 GB modules
  • DDR5 4800 MT/s speed rated at PC5-38400 bandwidth
  • ECC registered design detects and corrects single-bit errors
  • 10 V operating voltage reduces server power draw
  • Validated for ASUS RS520A-E12-RS24U 2U server compatibility

Target Server and Capacity

This 256GB kit comprises four 64GB DDR5 RDIMM modules built for the ASUS RS520A-E12-RS24U single-socket 2U server. Registered ECC operation protects data integrity in mission-critical workloads. The modules run at 1.10V and carry a CL40 latency rating.

Sustained Load Behaviour

Registered buffering and on-die ECC keep signal quality stable during continuous multi-threaded processing. Samsung, Micron or Hynix DRAM chips are stress-tested under load to verify long-term reliability. The 4800 MT/s data rate maintains throughput without thermal throttling in the supported chassis.

Pre-Installation Checklist

Confirm the server has four free 288-pin DDR5 RDIMM slots and that the BIOS revision supports 2Rx4 64GB registered modules. Verify the memory population rules for the specific CPU installed in the RS520A-E12-RS24U. Ensure the operating system and applications can address the full 256GB capacity.

How it compares

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

Price $6,127.99
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 $23.94 per GB
Pricier than about 69% 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

Will the 1.10 V DDR5 RDIMMs run hot or draw extra power in a 2U server running 24/7?

Each module operates at the standard DDR5 voltage of 1.10 V, so power draw and heat remain within normal server-memory limits for continuous operation.

Does the RS520A-E12-RS24U need any specific BIOS setting or firmware version before installing this 256 GB kit?

The kit is built to match the ASUS RS520A-E12-RS24U memory specification; follow the motherboard manual for any required BIOS updates before installation.

Can I keep existing DDR5 ECC RDIMMs in the other slots alongside these four 64 GB 2Rx4 modules?

The server’s memory controller requires identical rank and speed per channel, so mixing different capacities or ranks with this CL40 4800 MT/s kit is not supported.

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