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Eight green DDR4 RDIMM sticks, no heat spreaders, gold contacts visible

NEMIX RAM

NEMIX RAM MR21300-324K8 256GB (8x32GB) DDR4 2666 ECC RDIMM memory upgrade

SKU CH-MH28-8D94K

256 GB DDR4 server kit of eight 32 GB ECC registered DIMMs running at 2666 MT/s with CL19 latency

  • Total capacity256 GB (8 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V

Capacity 256GB 8X32GB

  • 256 GB total capacity from eight 32 GB modules
  • DDR4 2666 speed rated at PC4-21300 bandwidth
  • ECC registered design detects and corrects data errors
  • 2 V operation reduces server power draw
  • Validated for ASRock EPYCD8-2T series motherboards

256GB DDR4 2666 ECC RDIMM kit

This 256GB kit contains eight 32GB DDR4 2666 registered DIMMs with ECC. It is built for ASRock EPYCD8-2T series server motherboards that require registered memory with error correction. The modules run at 1.2V with a CAS latency of 19.

Upgrading from non-ECC or unbuffered memory

The kit replaces standard unbuffered or non-ECC modules when the platform demands registered ECC RDIMMs for data integrity. The jump is worth it when the motherboard manual specifies registered DDR4 2666 and the workload cannot tolerate silent data corruption.

Eight-module installation on a server board

Installing all eight DIMMs follows the motherboard's slot-population rules; the manual shows the required sequence for quad-channel operation. Common issues include mixing ranks or speeds, leaving slots in the wrong order, and forgetting to enable ECC in the BIOS after the hardware is seated.

How it compares

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

Price $1,634.99
Pricier than about 65% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (8 × 32 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $6.39 per GB
Cheaper than about 62% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineASRock Server Motherboard Compatible Series Memory
Model nameASRock DDR4 2666 MHz ECC RDIMM Registered Server Memory
Part numberMR21300-324K8
Total capacity256 GB (8 × 32 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 rank2Rx4
Power
Rated voltage1.2 V
Compatibility
Compatible systemsASRock
In the box
Included items256 GB (8 × 32 GB) DDR4 2666 MHz PC4-21300 2Rx4 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory KIT

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Questions about this item

Does the 288-pin DDR4 RDIMM form factor match the ASRock EPYCD8-2T motherboard slots?

Yes, the 288-pin DDR4 RDIMM modules fit the registered DIMM slots on the ASRock EPYCD8-2T series motherboard.

What is the correct order for populating the eight 32GB modules to enable quad-channel operation?

Install one module per channel following the motherboard manual's population sequence; the common mistake is filling all slots on one CPU socket before the second.

When should the 2Rx4 ECC registered modules be replaced if correctable error counts rise?

Replace modules when the platform's memory health log shows increasing correctable ECC errors, indicating chip degradation.

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