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Two green DDR5 RDIMM modules with black chips and gold contacts, no heat spreader

NEMIX RAM

NEMIX RAM DDR5 6400 256GB 2x128GB CL52 1.1V 4Rx4 RDIMM ECC memory upgrade for Supermicro X14SDW-42C-SP9F

SKU CH-V7DQ-ASFKW

256 GB DDR5-6400 ECC RDIMM kit (2 × 128 GB, CL52, 1.1 V, 4Rx4) validated for the Supermicro X14SDW-42C-SP9F 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

Size 256GB 2X128GB

  • 256 GB capacity with two 128 GB modules for full memory population
  • DDR5 6400 speed (PC5-51200) matches the board's rated frequency
  • CL52 latency and 1.10 V voltage meet the controller's exact timing requirements
  • 4Rx4 registered ECC design offloads the controller and corrects single-bit errors
  • 288-pin RDIMM form factor verified for Supermicro X14SDW-42C-SP9F motherboard

Exact-match DDR5 kit for Supermicro X14SDW

This NEMIX RAM kit provides 256GB of DDR5 memory in a matched pair of 128GB registered DIMMs. It is built for the Supermicro X14SDW-42C-SP9F motherboard where the memory controller expects 4Rx4 organization, 1.1V operation and CL52 timing at 6400 MT/s.

Registered ECC limits at DDR5 6400

Registered ECC RDIMMs reduce electrical load on the memory controller so every slot can run fully populated at the rated 6400 MT/s speed. The 4Rx4 density and 1.1V voltage are fixed by the DDR5 PC5-51200 standard; the board must support this exact rank and voltage combination or the modules will not initialize.

Verify population rules before ordering

Consult the Supermicro X14SDW-42C-SP9F manual for approved DIMM population order, maximum capacity per channel and any BIOS version requirements. This kit uses 288-pin RDIMMs with ECC and registered buffering; it will not work in boards that require unbuffered UDIMMs or SODIMM form factors.

How it compares

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

Price $9,576.99
Pricier than about 87% 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 $37.41 per GB
Pricier than about 90% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameNEMIX RAM
Product lineNEMIX RAM Original Series Server Memory
Model nameDDR5 ECC RDIMM Registered Server Memory
Part numberMR51200-744K2
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 rank4Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsSupermicro
In the box
Included items256 GB 2 × 128 GB DDR5 6400 MHz PC5-51200 4Rx4 1.1 V 288-PIN ECC RDIMM KIT

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Questions about this item

Should I choose the 256GB 2x128GB kit or a different capacity for my Supermicro X14SDW-42C-SP9F?

This kit provides 256GB total across two 128GB RDIMMs, matching the exact rank, voltage and timing the board expects for full-capacity recognition at DDR5 6400.

What does the DDR5 6400 rating mean once the modules are installed in the server?

The memory runs at 6400 MT/s with CL52 latency at 1.1V, delivering the rated PC5-51200 bandwidth when the motherboard populates both slots per its population rules.

How does the 288-pin RDIMM ECC registered interface affect real-world operation?

The registered design buffers each 4Rx4 module so the controller drives both slots at full speed, while ECC corrects single-bit errors on the fly to prevent silent data corruption.

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