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Four green DDR5 RDIMM modules in a clear tray

NEMIX RAM

NEMIX RAM RS520A-E12-RS12U 128GB (4x32GB) DDR5 4800 CL40 1.1V ECC RDIMM memory upgrade

SKU CH-N98P-Z25R3 MPN RS520A-E12-RS12U

128GB DDR5 4800 ECC registered server memory kit with four 32GB modules at CL40 and 1.1V

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 128 GB total capacity across four 32 GB modules
  • DDR5 4800 speed for high-throughput server workloads
  • ECC and registered design protects data integrity
  • 1 V operation reduces power draw
  • Validated for ASUS RS520A-E12-RS12U 2U server

Compatible ASUS 2U Server Memory

This 128 GB kit is built for the ASUS RS520A-E12-RS12U single-socket 2U server. It contains four 32 GB DDR5 4800 registered DIMMs with ECC and a CL40 latency. The modules run at 1.1 V and use a 1Rx4 organisation. They are designed for enterprise workloads that require error correction and registered buffering.

Simple DIMM Installation

The 288-pin RDIMMs install in the server's memory slots in minutes. No heat spreaders are fitted, so clearance inside the 2U chassis is not affected. Common issues include mixing registered and unbuffered modules or populating slots in the wrong order. Always follow the ASUS server manual for the correct population sequence and BIOS settings.

Verify Server Model Before Ordering

Confirm the exact model is RS520A-E12-RS12U; other ASUS 2U servers may use different qualified memory lists. Ensure the system supports DDR5 4800 registered ECC RDIMMs at 1.1 V. Check the maximum supported capacity per slot and total capacity for your specific CPU configuration. The kit provides four modules, so four compatible slots must be available.

How it compares

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

Price $3,487.99
Pricier than about 75% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $27.25 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 numberMR38400-314K4
Total capacity128 GB (4 × 32 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 rank1Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsASUS
In the box
Included items128 GB (4 × 32 GB) DDR5 4800 MHz PC5-38400 1Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

How can I confirm the 128GB kit is running at DDR5 4800 CL40 after installation?

Check the BIOS or UEFI memory information screen — it should show 4800 MT/s speed and CL40 latency for all four 32GB modules.

What comes in the package and do I need any extra parts for the RS520A-E12-RS12U server?

The box contains four 32GB DDR5 4800 ECC RDIMM modules (1Rx4, 1.1V, 288-pin); no additional components are required for this server model.

Which capacity option should I choose for the ASUS RS520A-E12-RS12U — is the 128GB (4x32GB) kit the right one?

Yes, this 128GB kit with four 32GB DDR5 4800 CL40 ECC RDIMMs is built specifically for the RS520A-E12-RS12U single-socket 2U server.

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