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Four green DDR4 RDIMM sticks, no heat spreaders, gold contacts visible

OWC

OWC 64GB (4×16GB) DDR4 2666 ECC Registered RDIMM server RAM

SKU CH-AQ1J-BEQD7

A 64GB quad-channel kit of four 16GB DDR4 2666 ECC registered RDIMM modules at 1.2V CL19 for Synology FlashStation FS3400, FS3410 and FS3600 servers

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 64GB (4 x 16GB)

Rank 2Rx4

  • ECC registered design protects data integrity in servers
  • 64GB total capacity across four 16GB modules
  • DDR4 2666MHz CL19 speed with 1.2V operation
  • JEDEC and RoHS compliant for warranty-safe upgrades
  • Backward compatible with 2133MHz and 2400MHz systems

Server memory kit for NAS upgrades

This OWC kit delivers 64 GB of DDR4 ECC registered memory across four 16 GB modules. It is built for Synology FlashStation FS3400, FS3410 and FS3600 systems that require registered DIMMs. Standard desktop boards cannot use this memory type.

Registered ECC with CL19 latency

Each 288-pin RDIMM runs at 2666 MHz (PC4-21300) with a CAS latency of 19 and operates at 1.2 V. The modules are dual-rank 2Rx4 and conform to JEDEC standards. Mixing with unbuffered or load-reduced DIMMs is not supported.

Steady throughput at rated speed

Under sustained load the kit maintains its 2666 MHz data rate and 1.2 V operating point without throttling. Backward compatibility with 2133 MHz and 2400 MHz platforms allows the same modules to run reliably at lower speeds when the system requires it.

How it compares

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

Price $419.99
Pricier than about 67% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB (4 × 16 GB)
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $6.56 per GB
Cheaper than about 58% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2R6D42R4064S
Total capacity64 GB (4 × 16 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

What does the 2666 MHz rating mean once the modules are installed in a server?

The modules operate at DDR4 2666 with CL19 timing at 1.2 V, providing the rated speed when the platform supports that data rate.

How does the PC4-21300 designation affect usable bandwidth?

PC4-21300 indicates the JEDEC standard DDR4 2666 specification; actual throughput depends on the memory controller and channel configuration of the host system.

What physical slot and clearance do the 288-pin RDIMMs require?

Each module uses a standard 288-pin DDR4 RDIMM form factor with no heat spreader, fitting registered DIMM slots in compatible servers, workstations or NAS units.

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