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Four green 288-pin DDR5 RDIMM modules with black chips, no heat spreaders

NEMIX RAM

NEMIX RAM RS520A-E12-RS24U 512GB (4x128GB) DDR5 4800 CL40 ECC RDIMM memory upgrade

SKU CH-CW9E-BVXHC MPN RS520A-E12-RS24U

512 GB DDR5 ECC registered server kit with four 128 GB modules at 4800 MT/s CL40 for the ASUS RS520A-E12-RS24U

  • Total capacity512 GB (4 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 512 GB total capacity from four 128 GB modules
  • DDR5 4800 MT/s speed rated at PC5-38400
  • ECC registered RDIMM for server data integrity
  • 10 V operating voltage reduces power draw
  • Validated for ASUS RS520A-E12-RS24U 2U server

512 GB DDR5 server memory kit

This 512 GB kit contains four 128 GB DDR5 4800 ECC registered DIMMs built for the ASUS RS520A-E12-RS24U single-socket 2U server. Each module runs at 1.1 V with CL40 latency and a 4Rx4 organisation using major OEM chips. The registered design adds signal buffering required by high-density server platforms.

4Rx4 registered ECC configuration

The 4Rx4 rank structure and registered interface are the decisive specification for compatibility with the target ASUS motherboard. ECC protection corrects single-bit errors in flight, while the registered buffer reduces electrical load on the memory controller. These attributes together determine whether the kit will post and run stably in the qualified system.

Low-voltage operation at 1.1 V

DDR5's standard 1.1 V supply voltage keeps power draw modest for a 512 GB population, and the modules carry no heat spreaders, relying on the server's directed airflow. In a properly cooled 2U chassis the DIMMs operate within thermal limits without audible fan ramp attributable to memory load.

How it compares

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

Price $16,020.99
Pricier than about 91% of the 21,161 comparable items (median $397.99).
Total capacity 512 GB (4 × 128 GB)
Higher than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $31.29 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 numberMR38400-744K4
Total capacity512 GB (4 × 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 items512 GB (4 × 128 GB) DDR5 4800 MHz PC5-38400 4Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

What does the DDR5-4800 CL40 rating mean once the kit is installed in the ASUS RS520A-E12-RS24U?

The modules operate at 4800 MT/s with 40-cycle CAS latency; the registered design and ECC let the server sustain that speed across all 512 GB under load.

How does the 288-pin DDR5 RDIMM interface affect usable bandwidth in this server?

The 288-pin DDR5 RDIMM socket is keyed for DDR5 only; the registered buffer and on-die ECC keep signal integrity at 4800 MT/s across four 128 GB modules.

What physical clearance does the 4Rx4 128 GB module need inside the 2U chassis?

Each 288-pin RDIMM is a standard-height module with no heat spreader, so it fits the ASUS RS520A-E12-RS24U DIMM slots without extra vertical clearance.

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