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Twelve green DDR5 RDIMM modules in anti-static tray

NEMIX RAM

NEMIX RAM RS520A-E12-RS12U 768GB (12x64GB) DDR5 4800 ECC RDIMM memory upgrade

SKU CH-41X8-MM1CG MPN RS520A-E12-RS12U

A 768 GB DDR5 ECC registered server kit with twelve 64 GB modules at 4800 MHz CL40 for the ASUS RS520A-E12-RS12U

  • Total capacity768 GB (12 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 768GB total capacity from twelve 64GB modules
  • DDR5 4800 speed with PC5-38400 bandwidth rating
  • ECC registered design protects data integrity in servers
  • CL40 latency at 1.1V operating voltage
  • 288-pin RDIMM form factor fits ASUS RS520A-E12-RS12U

Server Memory Kit

This 768GB DDR5 kit contains twelve 64GB registered ECC RDIMMs built for the ASUS RS520A-E12-RS12U single-socket 2U server. It targets administrators who need maximum memory capacity for virtualisation, databases or high-performance computing workloads. The modules run at 4800MT/s with CL40 latency at 1.1V.

Sustained Load Behaviour

ECC and registered buffering protect data integrity during continuous operation in mission-critical environments. The 2Rx4 organisation and major OEM DRAM from Samsung, Micron or Hynix maintain stability under heavy, prolonged memory pressure. Modules are stress-tested under load before shipping to verify reliability.

Build and Connectors

Each module uses a standard 288-pin DDR5 RDIMM form factor without a heat spreader, fitting the server's native DIMM slots directly. The 1.1V operating voltage aligns with the platform's power design. Twelve modules populate all available channels for the configured system.

How it compares

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

Price $21,056.99
Pricier than about 91% of the 21,161 comparable items (median $397.99).
Total capacity 768 GB (12 × 64 GB)
Higher than about 92% of the 20,941 comparable items (median 32 GB).
Price per GB $27.42 per GB
Pricier than about 76% 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 numberMR38400-924K12
Total capacity768 GB (12 × 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 items768 GB (12 × 64 GB) DDR5 4800 MHz PC5-38400 2Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

How much power does the 1.10V 768GB DDR5 4800 kit draw under sustained load?

At the rated 1.10 volts the 12 modules draw only modest power; registered DDR5 at 4800 MT/s typically stays well within standard server power budgets.

What must the ASUS RS520A-E12-RS12U already have for this 12x64GB kit to work?

The server needs 12 free 288-pin DDR5 RDIMM slots and a BIOS that supports 768 GB of registered ECC memory at 4800 MT/s.

Will the CL40 2Rx4 modules run at 4800 MT/s alongside older DDR5 DIMMs I keep?

The memory controller will down-clock all installed DIMMs to the lowest common speed and latency, so older DDR5 will force this kit to run slower.

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