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Two green DDR5 RDIMM modules without heat spreaders, 288 pins each

NEMIX RAM

NEMIX RAM 256GB (2x128GB) DDR5 6400 CL52 1.1V 2Rx4 ECC RDIMM memory upgrade for Supermicro H13SSW

SKU CH-RBF8-M7R7E

256 GB dual-rank DDR5 RDIMM kit with ECC and registered buffering for the Supermicro H13SSW motherboard

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 6400 (PC5 51200)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL52
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Exact 256GB DDR5-6400 kit matches Supermicro H13SSW specs for full-speed recognition
  • Registered ECC RDIMM design enables full-slot population with single-bit error correction
  • 1V CL52 timing delivers rated bandwidth at standard server voltage
  • 2Rx4 288-pin layout aligns with motherboard population rules for stable operation
  • Major OEM chips from Samsung, Micron or Hynix ensure enterprise-grade reliability

Exact-Match Upgrade Kit

This 256GB kit delivers two 128GB DDR5 RDIMMs built to the Supermicro H13SSW motherboard's exact specifications. Registered ECC architecture ensures the memory controller recognises every module at full rated speed without manual tuning. The 1.1V operating voltage matches the platform's native requirement for stable operation.

256GB Capacity and Registered Headroom

With 256GB across two slots the kit supports memory-intensive workloads such as virtualisation clusters, in-memory databases and large-scale rendering farms. Registered buffering offloads the controller so every populated slot runs at DDR5-6400 CL52 without signal degradation. ECC corrects single-bit errors on the fly to prevent silent data corruption in production environments.

Replaces Mismatched or Lower-Capacity Modules

The kit upgrades systems running slower DDR5 speeds, smaller densities or unbuffered DIMMs that the H13SSW cannot fully populate. Moving to matched 2Rx4 registered ECC modules unlocks the board's maximum supported capacity and rated bandwidth in a single step. The jump is worth it when current memory limits container density, database caching or compile throughput.

How it compares

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

Price $8,356.99
Pricier than about 85% 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 $32.64 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 lineNEMIX RAM Original Series Server Memory
Model nameDDR5 ECC RDIMM Registered Server Memory
Part numberMR51200-724K2
Total capacity256 GB (2 × 128 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 6400 (PC5 51200)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL52
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsSupermicro
In the box
Included items256 GB 2 × 128 GB DDR5 6400 MHz PC5-51200 2Rx4 1.1 V 288-PIN ECC RDIMM KIT

Questions about this item

Will the 2Rx4 registered ECC DDR5-6400 modules run at rated speed alongside existing DDR5 RDIMMs in my Supermicro H13SSW?

The kit is spec-matched to the H13SSW memory controller at DDR5-6400 CL52 1.1 V; mixing with other DDR5 RDIMMs of identical rank, voltage and timing should allow full-speed operation, but the board manual population order must be followed.

How can I confirm the 256 GB kit is recognised at full capacity and correct timing after installation?

Enter the BIOS and verify the memory summary shows 256 GB at DDR5-6400 (PC5-51200) with CL52 latency; ECC status should report active and no correctable errors logged during POST.

Does the MR51200-724K2 box contain only the two 128 GB RDIMMs or are any extra parts included?

The package includes exactly the 256 GB (2 × 128 GB) DDR5 6400 CL52 1.1 V 2Rx4 288-pin ECC registered RDIMM kit; no heat spreaders, cables or tools are supplied.

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