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Eight green DDR4 RDIMM sticks in a row

NEMIX RAM

NEMIX RAM MR21300-818K8 64GB (8x8GB) DDR4 2666 ECC RDIMM CL19 1.2V 288-pin

SKU CH-CM4X-6EBGK

Eight 8 GB DDR4 ECC registered DIMMs totalling 64 GB at 2666 MT/s CL19 1.2 V for compatible ASRock server boards

  • Total capacity64 GB (8 × 8 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V

Capacity 64GB 8X8GB

  • ECC registered design protects data integrity in servers
  • 64GB kit with eight 8GB modules scales memory capacity
  • DDR4 2666 speed matches platform specification
  • 2V operation reduces power draw per module
  • Validated for ASRock Rack ROMED8-2T EPYC motherboards

64GB DDR4 2666 ECC RDIMM kit

This 64GB kit contains eight 8GB DDR4 2666 ECC registered DIMMs built for the ASRock Rack ROMED8-2T motherboard and AMD EPYC platforms. It suits administrators who need validated, high-density memory for production servers and workstations.

Registered ECC limits and platform constraints

Registered ECC modules require a motherboard chipset and CPU that support registered signalling and error correction; consumer desktop boards cannot use them. The DDR4 2666 JEDEC standard caps transfer rates at this speed, so the kit will not run faster without platform overclocking support.

Check motherboard qualification and slot count

Verify that the target board appears on the ASRock Rack qualified-vendor list for this part number and that eight DDR4 RDIMM slots are available. Confirm the system BIOS is at a version that recognises 1Rx8 registered modules at 1.2V before ordering.

How it compares

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

Price $414.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (8 × 8 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $6.48 per GB
Cheaper than about 61% 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 numberMR21300-818K8
Total capacity64 GB (8 × 8 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 rank1Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsASRock
In the box
Included items64 GB (8 × 8 GB) DDR4 2666 MHz PC4-21300 1Rx8 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

Should I pick the 8-module kit or a smaller kit?

This kit ships as eight 8 GB modules for a total of 64 GB; choose it when the board has eight slots and you need the full capacity.

What does the 2666 MHz rating deliver once installed?

The modules run at DDR4 2666 with CL19 latency, giving the bandwidth and timing the EPYC platform expects for registered ECC workloads.

How does the RDIMM interface affect what the system can use?

Registered 288-pin DDR4 RDIMMs with ECC and 1Rx8 organisation are required; the memory controller will only accept this registered ECC type.

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