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Four green DDR4 RDIMM modules with gold contacts and black chips

NEMIX RAM

NEMIX RAM 64GB 4x16GB DDR4 2666 ECC RDIMM CL19 1.2V 288-pin ASRock EPYC memory upgrade

SKU CH-1AS7-YZ21C

64GB kit of four 16GB DDR4-2666 ECC registered DIMMs at CL19 and 1.2V for ASRock EPYC motherboards

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V

Capacity 64GB 4X16GB

  • 64 GB kit expands server capacity with four 16 GB modules
  • DDR4 2666 speed delivers 21300 MT/s throughput for heavy workloads
  • ECC registered design corrects errors to protect data integrity
  • Low 1.20 V operation reduces power draw in dense configurations
  • Validated for ASRock EPYC motherboards to ensure reliable compatibility

ASRock EPYC memory kit

This 64GB kit contains four 16GB DDR4 2666 registered DIMMs built for ASRock Rack ROMED8-2T motherboards running AMD EPYC processors. Each module operates at 1.2V with CL19 latency and includes ECC error correction for data integrity in server workloads. The 2Rx8 organisation and 288-pin RDIMM form factor match the board's registered memory slots exactly.

Replaces non-ECC or slower DDR4

The jump is worth it when your current installation uses unbuffered DIMMs, lower speeds or capacities that limit the number of ranks per channel. Registered ECC modules add the signal buffering and error detection that multi-socket EPYC platforms require for stable operation under sustained load. Systems already populated with identical 2666 RDIMMs will not see a functional improvement from this kit.

Four-slot population for quad-channel EPYC

The kit fills four DIMM slots to activate quad-channel bandwidth on compatible ASRock Rack motherboards. No heat spreaders are fitted, so airflow across the modules depends on the chassis and CPU cooler layout. Builders needing more than 64GB must verify the board's maximum supported capacity and rank limits before adding further kits.

How it compares

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

Price $402.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (4 × 16 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $6.30 per GB
Cheaper than about 62% 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 lineASRock Server Motherboard Compatible Series Memory
Model nameASRock DDR4 2666 MHz ECC RDIMM Registered Server Memory
Part numberMR21300-628K4
Total capacity64 GB (4 × 16 GB)
Product type288-Pin DDR4 RDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank2Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsASRock
In the box
Included items64 GB (4 × 16 GB) DDR4 2666 MHz PC4-21300 2Rx8 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory KIT

Other versions of this model

5 more in the same range

Questions about this item

Will the 288-pin RDIMMs fit the ASRock Rack ROMED8-2T motherboard slots?

Yes, the kit is built for that board and uses the standard 288-pin DDR4 RDIMM form factor.

What is the correct order to populate the four 16 GB modules on the EPYC platform?

Follow the motherboard manual for channel population; the usual mistake is skipping a primary slot and leaving a channel empty.

Do the Samsung, Micron or Hynix chips used in these modules require any periodic maintenance?

No scheduled maintenance is needed; ECC corrects single-bit errors on the fly and the modules run at 1.20 V without active cooling.

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