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Two green DDR5 RDIMM modules with black chips, no heat spreaders

NEMIX RAM

NEMIX RAM 128GB (2x64GB) DDR5 4800 CL40 2Rx4 1.1V ECC RDIMM memory upgrade RS520A-E12-RS24U

SKU CH-PMAA-AAH32 MPN RS520A-E12-RS24U

ECC registered DDR5 kit provides 128GB across two 64GB modules at 4800MHz CL40 for compatible ASUS servers

  • Total capacity128 GB (2 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 128GB kit in two 64GB modules for high server capacity
  • DDR5 4800 speed with PC5-38400 bandwidth for fast data throughput
  • CL40 CAS latency at 1.1V for efficient registered operation
  • ECC RDIMM with 2Rx4 rank for error-correcting reliability
  • Validated for ASUS RS520A-E12-RS24U 2U server compatibility

Compatibility & Capacity

This 128 GB kit contains two 64 GB DDR5 modules built for the ASUS RS520A-E12-RS24U server. ECC registered RDIMM design adds error correction and signal buffering for stable operation under heavy workloads.

Suited Builds & Limits

Ideal for administrators expanding memory in the named ASUS 2U platform where registered ECC DDR5 is required. Not suited for consumer desktop boards, laptops, or any system that accepts only unbuffered non-ECC memory.

Deciding Specification

Registered ECC RDIMM layout with CL40 timing at 4800 MT/s and 1.10 V determines fit; the motherboard must support DDR5 registered ECC DIMMs or the modules will not function.

How it compares

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

Price $3,055.99
Pricier than about 73% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (2 × 64 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $23.87 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 numberMR38400-924K2
Total capacity128 GB (2 × 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 items128 GB (2 × 64 GB) DDR5 4800 MHz PC5-38400 2Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

What CAS latency does the DDR5 4800 kit run at under sustained load?

The modules operate at CL40 timings at the rated DDR5 4800 speed.

How much heat do the 64 GB registered DIMMs produce when the server runs all day?

The kit has no heat spreader and runs at the standard DDR5 1.1 V, so thermal output stays within normal registered DIMM limits.

Which ASUS server motherboard must already be installed for this memory kit to function?

The kit is validated for the ASUS RS520A-E12-RS24U single-socket 2U server.

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