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Eight green 288-pin DDR4 RDIMM modules in static bags

OWC

OWC 256GB (8x32GB) DDR4 2666 ECC Registered RDIMM Server RAM

SKU CH-6HCH-P549P

Eight 32 GB DDR4 2666 ECC registered RDIMMs deliver 256 GB for servers, workstations and NAS systems

  • Total capacity256 GB (8 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 256GB (8 x 32GB)

Rank 2Rx4

  • 256 GB server memory kit built from eight 32 GB modules
  • DDR4 2666 MHz speed with CL19 latency for responsive workloads
  • ECC registered design detects and corrects data errors automatically
  • JEDEC-standard 1.2 V operation keeps power draw low
  • Compatible with Synology FS6400 and HD6500 plus 2133/2400 MHz systems

Server ECC Registered Kit

This 256GB kit contains eight 32GB DDR4 2666 modules built for servers, workstations and NAS systems that require ECC Registered memory. It is not compatible with standard desktop computers or with unbuffered and load-reduced DIMMs.

JEDEC Compliant Upgrade

The modules meet JEDEC PC4-21300 specifications at CL19 latency and 1.2V, and they are backward compatible with 2133MHz and 2400MHz slots. Each stick is validated to exceed OEM requirements for warranty-safe installation.

288-Pin RDIMM Form Factor

Registered buffering adds a clock cycle to stabilise heavy multi-DIMM loads in multi-channel configurations. The 2Rx4 organisation supports high-density population without a heat spreader, fitting standard 288-pin DDR4 slots in compatible chassis.

How it compares

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

Price $1,719.99
Pricier than about 85% of the 6,523 comparable items (median $188.99).
Total capacity 256 GB (8 × 32 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $6.72 per GB
Cheaper than about 56% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2R6D42R4256K
Total capacity256 GB (8 × 32 GB)
Product type288-Pin DDR4 SDRAM
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

Will the 8x32GB DDR4 2666 ECC Registered RDIMM modules need replacement under normal server operation?

DDR4 ECC Registered RDIMM modules are solid-state with no moving parts, so they do not wear out from normal read/write cycles and rarely need replacement unless a module fails or capacity requirements change.

What is the first limit reached when the 256GB kit runs at 2666 MHz CL19 continuously?

The first limit is the JEDEC-standard 1.2 V operating voltage and CL19 latency at 2666 MHz; sustained loads stay within these rated electrical and timing boundaries.

How much heat and power do the eight 32GB 1.2 V registered DIMMs produce during all-day operation?

Each 32GB DDR4 2666 CL19 registered DIMM runs at 1.2 V with no heat spreader, so total power draw and heat output remain low and within typical server DIMM thermal envelopes.

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