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Eight green DDR4 RDIMM modules with gold contacts and black chips

OWC

OWC 64GB (8x8GB) DDR4 2666MHz CL19 ECC Registered RDIMM 1.2V 288-pin Server RAM

SKU CH-26G8-HCF9Y

Eight 8 GB DDR4-2666 ECC registered RDIMMs totalling 64 GB with CL19 latency and 1.2 V operation for servers and workstations

  • Total capacity64 GB (8 × 8 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank1Rx4

Capacity 64GB (8 x 8GB)

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Rank 1Rx4

  • ECC registered design protects data integrity in servers
  • 64GB kit with eight 8GB modules expands capacity
  • DDR4 2666MHz CL19 at 1.2V balances speed and efficiency
  • 288-pin RDIMM fits server, workstation and NAS systems
  • Backward compatible with 2133MHz and 2400MHz platforms

Server Memory Upgrade

This 64GB kit contains eight 8GB DDR4 2666MHz CL19 ECC registered RDIMM modules. It is built for servers, workstations and NAS systems that require registered memory with error correction. The modules operate at 1.2V and use the 288-pin form factor. Standard desktop computers cannot use this memory.

DDR4 2666MHz Registered Limits

The registered design adds a clock cycle to address signals, which stabilises heavy loads but prevents use in consumer platforms that expect unbuffered modules. Speed falls back to 2133MHz or 2400MHz when the system bus requires it. Mixing these modules with unbuffered memory is not supported and will cause boot failure.

64GB Capacity and Headroom

Eight ranks of 1Rx4 DRAM deliver 64GB total, suited for virtualisation hosts, database caches and multi-user workloads. The CL19 latency and 2666MHz throughput handle typical server tasks, but memory-bound compute clusters may saturate bandwidth before capacity is exhausted. No heat spreader is fitted, so airflow must be managed by the chassis.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $587.99
Pricier than about 73% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB (8 × 8 GB)
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $9.19 per GB
Pricier than about 64% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2R6D41R4064K
Total capacity64 GB (8 × 8 GB)
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank1Rx4
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

5 more in the same range

Questions about this item

Should I pick the 64GB kit or a smaller capacity for my server?

The kit supplies 64GB total across eight 8GB modules, so choose it when your workload needs that much ECC registered memory.

What does the 2666MHz speed mean once the RAM is installed?

The modules run at DDR4 2666 (PC4-21300) with CL19 latency and will also operate at 2133MHz or 2400MHz if the system requires a lower speed.

Is the 288-pin RDIMM interface limited to certain platforms?

The 288-pin ECC registered DIMM fits server, workstation and NAS systems that support registered DDR4 memory; it will not work in standard desktop boards.

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