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Eight green 288-pin DDR4 RDIMM modules with black chips no heat spreaders

OWC

OWC 512GB (8x64GB) DDR4 2666MHz CL19 ECC Registered RDIMM 1.2V 288-pin Server RAM

SKU CH-9XQW-GM5SR

Eight 64 GB DDR4 2666 MHz ECC registered RDIMMs totalling 512 GB for server or workstation upgrades

  • Total capacity512 GB (8 × 64 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 512GB (8 x 64GB)

Show 7 more

Rank 2Rx4

  • 512 GB capacity for high-density server workloads
  • 8 x 64 GB modules populate all channels efficiently
  • DDR4 2666 MHz CL19 matches PC4-21300 bandwidth
  • ECC registered design detects and corrects memory errors
  • 2 V operation lowers power draw per module

Server Memory Kit

This OWC kit supplies 512GB of DDR4 ECC registered memory across eight 64GB modules. It operates at 2666MHz with CL19 latency and 1.2V power draw. The 288-pin RDIMMs are built for servers, workstations and NAS systems that require registered error-correcting RAM.

Compatibility Scope

The modules suit administrators upgrading multi-socket platforms that mandate registered ECC memory and can populate eight slots. They will not work in standard desktop boards that accept only unbuffered non-ECC DIMMs, and they cannot be mixed with unbuffered memory in the same system.

Capacity and Headroom

Eight 64GB modules deliver 512GB total, giving ample headroom for virtualisation hosts, large in-memory databases and heavy multi-tenant workloads. The kit runs at 2666MHz and remains backward compatible with 2133MHz and 2400MHz bus speeds. Systems limited to fewer than eight slots or lower maximum capacity per slot cannot use the full kit.

How it compares

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

Price $3,285.99
Pricier than about 90% of the 6,523 comparable items (median $188.99).
Total capacity 512 GB (8 × 64 GB)
Higher than about 91% of the 6,064 comparable items (median 32 GB).
Price per GB $6.42 per GB
Cheaper than about 59% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2R6D42R4512K
Total capacity512 GB (8 × 64 GB)
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
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

My motherboard has eight DDR4 RDIMM slots — will this 512GB kit fill them all?

Yes, the kit contains eight 64GB modules that occupy all eight slots for a total of 512GB.

Can I keep my existing 2133MHz ECC registered DIMMs and add these 2666MHz modules?

The modules are backward compatible with 2133MHz and 2400MHz speeds, but registered ECC memory cannot be mixed with unbuffered memory.

After installing the eight modules, how do I confirm they are running at 2666MHz with ECC active?

Check the BIOS memory information or run a system tool such as dmidecode; it should report 2666MHz, CL19, 1.2V and ECC registered for each 64GB DIMM.

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