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

NEMIX RAM

NEMIX RAM CSE-735D4-1K26B 256GB (2x128GB) DDR5 4800 ECC RDIMM memory upgrade

SKU CH-FYGM-2QJF1 MPN CSE-735D4-1K26B

256 GB DDR5-4800 ECC registered server memory kit, two 128 GB RDIMMs at 1.1 V CL40 for SuperMicro workstations

  • 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 kit (2 × 128 GB) scales memory capacity for heavy workloads
  • DDR5 4800 MT/s (PC5-38400) delivers high throughput for server tasks
  • ECC RDIMM with CL40 latency protects data integrity under load
  • 1 V operating voltage reduces power draw per module
  • Validated for SuperMicro SuperWorkstation SYS-531A-I compatibility

Server-grade DDR5 ECC RDIMM kit

This 256 GB kit contains two 128 GB registered DDR5 modules built for Supermicro SuperWorkstation SYS-531A-I systems. ECC and registered buffering protect data integrity in mission-critical workloads. The modules run at 4800 MT/s with CL40 latency at 1.10 V. No heat spreaders are fitted.

Sustained-load behaviour

Registered buffering and on-die ECC maintain stability during continuous multi-threaded workloads such as virtualisation, database serving or scientific compute. The 4Rx4 organisation increases density per channel without adding electrical load. Modules are stress-tested under load before shipment to verify long-term reliability.

Deciding specification

The kit is validated only for the Supermicro SuperWorkstation SYS-531A-I platform using the CSE-735D4-1K26B part number. Builders targeting any other motherboard or workstation model cannot rely on this compatibility. Supermicro X13SRA-TF is the referenced board for this configuration.

How it compares

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

Price $7,760.99
Pricier than about 84% 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 $30.32 per GB
Pricier than about 87% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineSuperMicro Server/Workstation Compatible Series Memory
Model nameSuperMicro 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 systemsSupermicro
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

How much heat does the 1.1 V DDR5 4800 ECC RDIMM kit generate when the SuperMicro SYS-531A-I runs continuously?

Each 128 GB module operates at 1.10 V with CL40 latency; registered buffering and ECC add minimal overhead, so sustained power draw stays close to the rated voltage across both DIMMs.

What motherboard slot and BIOS support are required to run this 256 GB DDR5 4800 ECC RDIMM kit in the SuperMicro SYS-531A-I?

The kit uses 288-pin DDR5 RDIMM form factor; the SYS-531A-I provides matching slots and its BIOS recognises 4Rx4 registered ECC modules at 4800 MT/s without extra configuration.

Will the 4Rx4 registered ECC modules work alongside any existing DDR5 RDIMM sticks already installed in the SuperMicro SYS-531A-I?

All slots must use identical 4Rx4 registered ECC DIMMs at the same speed; mixing ranks or unbuffered modules prevents the memory controller from initialising the full 256 GB capacity.

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