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Green rectangular DDR4 memory module with gold edge connector and black chips, no heat spreader

OWC

OWC 8GB DDR4 2666 ECC Registered RDIMM 2R6D41R408GB

SKU CH-BSME-6TD2A

An 8 GB DDR4 2666 MHz ECC registered RDIMM for servers, workstations and NAS systems, CL19 at 1.2 V with backward compatibility to 2133 MHz and 2400 MHz

  • Total capacity8 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank1Rx4

Capacity 8GB

Rank 1Rx4

  • ECC registered design protects data integrity in servers
  • 2666 MHz DDR4 speed with CL19 latency for responsive performance
  • 2 V operation reduces power draw in compatible systems
  • Backward compatible with 2133 MHz and 2400 MHz platforms
  • Single 8 GB 1Rx4 module simplifies capacity upgrades

Compatible Synology Memory Upgrade

This 8 GB DDR4 2666 MHz ECC registered RDIMM replaces Synology modules D4RD-2666-8G and D4ER01-8G. It fits the Synology FlashStation FS2017 and other systems that accept 288-pin registered DIMMs. The module runs at 1.2 V with CL19 latency and is sold new. It is a single-rank 1Rx4 design without a heat spreader.

Suited for Servers and NAS Only

This memory is built for servers, workstations and NAS devices that require registered ECC DDR4. It will not work in standard desktop computers or laptops that use unbuffered modules. Buyers who need non-ECC or load-reduced memory should look at something else. Mixing registered and unbuffered DIMMs is not supported by the platform.

Registered ECC DDR4 Form Factor

The stick uses the 288-pin registered DIMM form factor with on-board ECC and a parity configuration of 1Rx4. This registered interface is the single specification that determines whether the module will be accepted by the memory controller. If the system requires unbuffered or load-reduced DIMMs, this part will not function.

How it compares

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

Price $74.99
Cheaper than about 77% of the 6,523 comparable items (median $188.99).
Total capacity 8 GB
Lower than about 80% of the 6,064 comparable items (median 32 GB).
Price per GB $9.37 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 number2R6D41R408 GB
Total capacity8 GB
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank1Rx4
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

5 more in the same range

Questions about this item

My motherboard only has standard 288-pin DDR4 slots — will this registered ECC RDIMM work in them?

No. This 288-pin DDR4 2666 CL19 1.2 V module is ECC registered (RDIMM) and requires a server or workstation board that explicitly supports registered memory; standard desktop boards do not.

I still have some 2133 MHz DDR4 ECC registered sticks — can I add this 2666 MHz module alongside them?

Yes. The module is backward compatible with 2133 MHz and 2400 MHz ECC registered memory, so it will run at the speed of the slowest installed DIMM.

After installing the module, how can I confirm the ECC registered function is active?

Enter the system BIOS or UEFI and verify the memory is reported as ECC registered running at 2666 MHz (PC4-21300) with CL19 timings at 1.2 V.

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