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Two green DDR5 RDIMM sticks, 288-pin, no heat spreader

NEMIX RAM

NEMIX RAM RS520A-E12-RS12U 256GB (2x128GB) DDR5 4800 ECC RDIMM memory upgrade

SKU CH-VFMQ-6PBX7 MPN RS520A-E12-RS12U

Adds 256 GB of DDR5 4800 ECC registered memory in two 128 GB modules for the ASUS RS520A-E12-RS12U server

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 256 GB total capacity from two 128 GB modules
  • DDR5 4800 speed rated at PC5-38400 bandwidth
  • ECC registered RDIMM design protects data integrity
  • 1 V operating voltage reduces power draw
  • Validated for ASUS RS520A-E12-RS12U 2U server compatibility

System-Specific DDR5 Server Memory

This 256 GB kit provides two 128 GB DDR5 4800 registered ECC RDIMMs built for the ASUS RS520A-E12-RS12U 2U server. The modules operate at 1.1 V with CL40 latency and a 4Rx4 organisation using major OEM DRAM. They are validated for the named platform to ensure stability in mission-critical workloads.

For Single-Socket ASUS 2U Server Upgrades

The kit suits administrators expanding memory in the specified ASUS single-socket 2U model where registered ECC DDR5 is required. It is not for desktop motherboards, consumer laptops, or any system that accepts only unbuffered non-ECC memory or a different DDR generation.

Registered ECC DDR5 with 4Rx4 Organisation

The registered buffer and on-die ECC protect data integrity under sustained server loads, while the 4Rx4 rank structure delivers high density per slot. Compatibility is limited to platforms qualified for this exact registered DDR5 configuration.

How it compares

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

Price $8,390.99
Pricier than about 85% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (2 × 128 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $32.78 per GB
Pricier than about 90% 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 numberMR38400-744K2
Total capacity256 GB (2 × 128 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 rank4Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsASUS
In the box
Included items256 GB (2 × 128 GB) DDR5 4800 MHz PC5-38400 4Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

Will this 256GB DDR5 4800 kit work in my ASUS RS520A-E12-RS12U server?

Yes, the kit is built for that exact model. It provides two 128GB registered ECC RDIMMs at 1.1V with CL40 timing.

Can I mix these 4Rx4 modules with existing 2Rx4 DDR5 RDIMMs in the same server?

Mixing different rank configurations is not recommended; the motherboard typically requires identical rank layouts per channel for stable operation.

How do I verify the memory is running at DDR5 4800 with ECC active after installation?

Check the BIOS memory information screen — it should show 4800 MT/s, CL40, 1.1V and ECC enabled for each 128GB module.

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