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Green rectangular DDR5 RDIMM module with gold contacts and black memory chips, no heat spreader

NEMIX RAM

NEMIX RAM 128GB DDR5 6400MHz PC5-51200 2Rx4 CL52 1.1V ECC Registered RDIMM memory upgrade

SKU CH-MG20-M05D7

128 GB DDR5 6400 MHz ECC registered RDIMM with CL52 latency and 1.1 V operation, validated for the ASRock Rack GNRAPD12DNO motherboard

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

Size 128GB

Show 4 more
  • 128 GB capacity expands server memory headroom
  • DDR5 6400 speed delivers rated bandwidth
  • CL52 latency matches controller timing
  • Registered ECC architecture corrects single-bit errors
  • 288-pin RDIMM form factor fits ASRock Rack GNRAPD12DNO

Exact-match server upgrade

This 128 GB DDR5-6400 module is built for the ASRock Rack GNRAPD12DNO motherboard. It uses a 288-pin RDIMM form factor with registered ECC architecture and a 2Rx4 rank layout. The 1.1 V operating voltage and CL52 timing match the board's memory controller requirements exactly.

Replaces non-ECC or slower DDR5

The jump is worth it when your workload demands full-slot population without signal degradation and on-the-fly single-bit error correction. Unbuffered DIMMs or lower-speed modules cannot deliver the same stability at maximum capacity across every channel.

Fits registered-DIMM platforms only

The board must support registered ECC RDIMMs and the specific population order listed in its manual. No heat spreader is included, so airflow across the modules must be provided by the chassis. This kit frees you from mixing ranks or voltages that cause boot failures or reduced throughput.

How it compares

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

Price $4,157.99
Pricier than about 77% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $32.48 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 numberMR51200-724K1
Total capacity128 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 items128 GB DDR5 6400 MHz PC5-51200 2Rx4 1.1 V 288-PIN ECC RDIMM KIT

Other versions of this model

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Questions about this item

Will the 288-pin RDIMM fit the ASRock Rack GNRAPD12DNO motherboard DIMM slots?

Yes, the 288-pin Registered RDIMM form factor matches the DDR5 slots on the ASRock Rack GNRAPD12DNO motherboard; it is not a UDIMM or SODIMM.

What is the correct population order when installing this 2Rx4 Registered ECC module?

Follow the motherboard manual for the approved DIMM population sequence; registered modules must be installed in the specified slot order for full capacity recognition.

Does the lack of a heat spreader affect long-term reliability of this 128GB DDR5 module?

The module operates at the standard 1.1V DDR5 voltage without a heat spreader; adequate chassis airflow is recommended for sustained server workloads.

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