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Green circuit board with black memory chips and gold edge connector

OWC

OWC 8GB DDR4 2666 ECC UDIMM CL19 1.2V 1Rx8 288-pin memory upgrade

SKU CH-JHRN-QWAW7

8 GB DDR4 2666 MHz ECC UDIMM with CL19 latency, 1.2 V operation and 288-pin form factor, validated for Synology RackStation RS3621RPxs and RS3621xs+

  • Total capacity8 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank1Rx8

Capacity 8GB

  • 8GB capacity expands NAS memory for heavier workloads
  • DDR4 2666 CL19 speed matches Synology RS3621RPxs and RS3621xs+ specs
  • ECC unbuffered design protects data integrity in RAID arrays
  • 2V low voltage reduces power draw and heat
  • JEDEC-standard module ensures warranty-safe, drop-in compatibility

Compatible Synology RackStation memory upgrade

This 8 GB DDR4 ECC UDIMM is built for the Synology RackStation RS3621RPxs and RS3621xs+ NAS units. It delivers 2666 MHz speed with CL19 latency at 1.2 V. The unbuffered design suits the supported platforms directly.

JEDEC and RoHS compliant single module

The stick meets JEDEC standards and RoHS requirements for a warranty-safe upgrade. It operates as a 1Rx8 rank without a heat spreader. Backward compatibility covers 2133 MHz and 2400 MHz systems automatically.

Verify NAS model and slot availability

Confirm your unit is exactly the RS3621RPxs or RS3621xs+ before ordering. Check how many 288-pin DIMM slots are free in the chassis. Ensure the system accepts unbuffered ECC UDIMMs at 1.2 V.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $61.99
Cheaper than about 75% of the 21,161 comparable items (median $397.99).
Total capacity 8 GB
Lower than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $7.75 per GB
Typical for this category: the median of 20,941 items is $8.19 per GB.

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameOWC
Part number2E6D41R808 GB
Total capacity8 GB
Product type288-Pin DDR4 ECC UDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology RackstationRS3621RPxs
Synology RackstationRS3621xs+

Other versions of this model

5 more in the same range

Questions about this item

Will the 1Rx8 ECC UDIMM need any periodic maintenance or replacement during the life of the NAS?

The module is a solid-state component with no moving parts and no user-serviceable elements; it is designed to run for the lifetime of the Synology RackStation RS3621RPxs or RS3621xs+ without scheduled maintenance or replacement.

What limit appears first when the DIMM runs continuously at 2666 MHz in a 24/7 NAS workload?

The primary limit is the JEDEC-defined 1.2 V operating voltage and CL19 latency; the ECC logic corrects single-bit errors on the fly, so sustained throughput stays within spec without throttling.

How much heat and power does the 8 GB stick produce when the rack unit runs all day?

At 1.2 V the module draws only a few watts and has no heat spreader, so it adds minimal thermal load to the chassis airflow and runs silently with no active cooling required.

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