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Two green 288-pin DDR4 RDIMM modules, no heat spreaders, 64GB kit

OWC

OWC 64GB (2x32GB) DDR4 2666 ECC Registered RDIMM Server RAM

SKU CH-6C1A-CFEZW

A 64GB dual-channel kit of DDR4 2666 ECC registered RDIMM modules for compatible servers, workstations and NAS systems

  • Total capacity64 GB (2 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 64GB (2 x 32GB)

Rank 2Rx4

  • ECC registered design protects data integrity in servers
  • 64 GB dual-channel kit boosts multitasking capacity
  • DDR4 2666 MHz CL19 speed matches system specs
  • 2 V operation reduces power draw
  • Compatible with Synology FS3400 FS3410 FS3600 NAS

Targeted Server Upgrade

This 64GB kit delivers two 32GB DDR4 2666 ECC registered RDIMMs for Synology FlashStation FS3400, FS3410 and FS3600 systems. It replaces the D4RD-2666-32G and D4ER01-32G modules in workstations and NAS devices that require registered memory. Standard desktop computers cannot use these modules.

Registered ECC Functionality

The registered buffer and ECC circuitry correct single-bit errors and reduce electrical load on the memory controller, which is essential for 24/7 server stability. Mixing these DIMMs with unbuffered or load-reduced memory is not supported, so the full kit must populate matched channels. JEDEC and RoHS compliance ensures a warranty-safe upgrade.

288-Pin RDIMM Build

Each module uses a 288-pin DDR4 interface at 1.2V with CL19 timing and 2Rx4 organisation. The kit runs at 2666MHz and is backward compatible with 2133MHz and 2400MHz bus speeds. No heat spreader is fitted, so airflow in the chassis must accommodate bare PCBs.

How it compares

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

Price $402.99
Pricier than about 66% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB (2 × 32 GB)
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $6.30 per GB
Cheaper than about 61% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2R6D42R4064P
Total capacity64 GB (2 × 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

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Questions about this item

Will the 32GB modules ever need replacement under normal server operation?

The modules are built to JEDEC and ROHS standards with no moving parts, so they do not require scheduled replacement; they remain in service until a capacity upgrade is desired.

What limit appears first when the kit runs continuously at 2666MHz?

The registered buffer and CL19 latency set the timing ceiling; sustained throughput is bounded by the DDR4 2666 PC4-21300 specification rather than thermal or power constraints.

How much heat and power does the 64GB kit produce during all-day use?

Each 32GB DIMM operates at 1.2V without a heat spreader, so power draw and heat output stay low enough for standard server airflow to manage.

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