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 tray

NEMIX RAM

NEMIX RAM 256GB (2x128GB) DDR5 6400 CL52 ECC RDIMM ASRock Rack GNRAPD12DNO memory upgrade

SKU CH-2J2X-2AKEW

256GB dual-rank DDR5-6400 ECC RDIMM kit validated for ASRock Rack GNRAPD12DNO servers

  • 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

Show 4 more
  • 256 GB capacity from two 128 GB modules
  • DDR5 6400 speed with CL52 latency for rated performance
  • Registered ECC architecture prevents data corruption in servers
  • 1 V operation matches platform memory-controller requirements
  • Verified fit for ASRock Rack GNRAPD12DNO motherboard

256GB DDR5 6400 ECC RDIMM kit for ASRock Rack

This 256GB kit contains two 128GB DDR5 6400 RDIMMs built to the exact rank, voltage and timing the ASRock Rack GNRAPD12DNO motherboard expects. Registered ECC architecture lets every slot run fully populated at rated speed while correcting single-bit errors on the fly. It is intended for server administrators who need guaranteed compatibility and maximum capacity on this specific platform.

DDR5 6400 RDIMM limits

DDR5 6400 RDIMMs operate at 1.1V with a CAS latency of 52 and a 288-pin form factor that only fits DDR5 RDIMM slots. Registered buffering offloads the memory controller so all channels can be filled without signal degradation, but the modules will not work in UDIMM or SODIMM sockets. Buyers who need unbuffered memory or a different pin layout must choose another product.

2Rx4 rank and 1.1V specification

Each module uses a 2Rx4 organisation at 1.1V, the exact configuration the board's memory controller validates during training. If your system requires a different rank structure or voltage, this kit will not post or will run at reduced capacity. Always confirm the motherboard's qualified-vendor list before ordering.

How it compares

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

Price $8,205.99
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 $32.05 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 numberMR51200-724K2
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 systemsASRock Rack
In the box
Included items256 GB 2 × 128 GB DDR5 6400 MHz PC5-51200 2Rx4 1.1 V 288-PIN ECC RDIMM KIT

Other versions of this model

5 more in the same range

Questions about this item

Should I choose the 256GB kit with two 128GB modules or a different capacity for my ASRock Rack GNRAPD12DNO?

This kit provides 256GB using two 128GB DDR5 RDIMMs. It is the exact-match upgrade specified for the ASRock Rack GNRAPD12DNO motherboard, matching the required rank, voltage, and timing so the memory controller recognises full capacity at rated speed.

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

The modules run at DDR5 6400 (PC5 51200) with CL52 latency at 1.1V. Registered architecture offloads the memory controller, allowing every populated slot to operate at this rated speed and full capacity without downclocking.

Is the 288-pin RDIMM interface compatible with standard DDR5 UDIMM slots, and what does the registered design limit in practice?

No, 288-pin RDIMMs only fit registered DIMM slots. The registered (buffered) design caps electrical load on the memory controller, enabling stable operation when all slots are populated at 256GB total, while ECC corrects single-bit errors on the fly.

More in Model-Specific Memory Upgrades

Similar items