We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Two green DDR5 RDIMM modules in anti-static packaging

NEMIX RAM

NEMIX RAM MR51200-944K2 128GB 2x64GB DDR5 6400 CL52 ECC RDIMM Supermicro X14SDW-64C-SP9F memory upgrade

SKU CH-V89J-3NW2A

128 GB DDR5 6400 ECC registered kit with two 64 GB 4Rx4 modules at 1.1 V CL52 for Supermicro X14SDW-64C-SP9F

  • Total capacity128 GB (2 × 64 GB)
  • Rated speedDDR5 6400 (PC5 51200)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL52
  • Rated voltage1.1 V
  • Buffer typeRegistered

Size 128GB 2X64GB

Show 4 more
  • Exact-match 128GB DDR5-6400 kit installs at full rated speed
  • Registered ECC 4Rx4 architecture corrects single-bit errors on the fly
  • 1V operation matches Supermicro X14SDW-64C-SP9F memory controller specs
  • 288-pin RDIMM form factor fits the board's required slot type
  • Lifetime replacement warranty with US-based technical support included

Exact-match DDR5-6400 kit

This 128GB kit contains two 64GB DDR5 RDIMMs rated at 6400 MT/s with CL52 latency and 1.10V operation. Registered ECC architecture with 4Rx4 organisation targets the Supermicro X14SDW-64C-SP9F motherboard. It is built for servers that require registered modules and on-die error correction.

DDR5 slot population rules

The motherboard dictates how many registered DIMMs it accepts per channel and in which order they must be installed. Filling every slot at the rated 6400 speed depends on the platform's memory controller and BIOS revision. Exceeding the approved configuration forces the system to down-clock or fail to boot.

4Rx4 registered ECC specification

The 4Rx4 registered ECC layout is the single attribute the memory controller checks before enabling full capacity at 6400 MT/s. A different rank count, unbuffered design, or missing ECC will prevent the kit from operating as intended. Buyers who need unbuffered UDIMMs or non-ECC memory cannot use this kit.

How it compares

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

Price $4,366.99
Pricier than about 78% 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 $34.12 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 numberMR51200-944K2
Total capacity128 GB (2 × 64 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 items128 GB 2 × 64 GB DDR5 6400 MHz PC5-51200 4Rx4 1.1 V 288-PIN ECC RDIMM KIT

Other versions of this model

5 more in the same range

Questions about this item

Is the 128GB 2x64GB kit the only capacity option for this NEMIX RAM MR51200-944K2?

Yes, this part number is offered only as a 128GB kit containing two 64GB modules.

What does the DDR5 6400 speed rating mean once the modules are installed in a Supermicro X14SDW-64C-SP9F?

The memory controller will recognise the kit at its rated 6400 MT/s, delivering PC5-51200 bandwidth with CL52 latency at 1.10V.

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

The registered buffer reduces electrical load so all slots can run fully populated, while ECC corrects single-bit errors to prevent silent data corruption.

More in Model-Specific Memory Upgrades

Similar items