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Green circuit board with gold edge connectors and black memory chips

OWC

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

SKU CH-FGH9-MGW0J

Adds 8 GB of DDR4 2666 CL19 UDIMM memory to compatible QNAP NAS models including TS-h1277XU-RP, TS-h1677XU-RP, TS-h2477XU-RP and TS-h977XU-RP

  • Total capacity8 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank1Rx8
  • Boosts QNAP NAS capacity with 8GB DDR4 2666 CL19 module
  • JEDEC and RoHS compliant for warranty-safe upgrade
  • Low 1.2V voltage reduces power draw and heat
  • Backward compatible with 2133 and 2400MHz systems
  • Simple DIY installation fits 288-pin UDIMM slots

8GB DDR4 2666 UDIMM for QNAP NAS

This single 8GB DDR4 2666 module is built for the QNAP TS-h1277XU-RP, TS-h1677XU-RP, TS-h2477XU-RP and TS-h977XU-RP. It delivers a straightforward capacity increase for those NAS units without requiring ECC or registered memory. The non-ECC unbuffered design matches the original specification for these systems.

Thermals and power at 1.2V

Operating at 1.2V, the module runs cool without a heat spreader and draws minimal power during typical NAS workloads. JEDEC-standard timings of CL19 at 2666MHz keep latency predictable while the low voltage limits heat output inside the chassis. Silent operation is inherent with no moving parts to generate noise.

Fits 288-pin DDR4 slots with backward speed support

The 288-pin UDIMM form factor slots directly into compatible QNAP bays and requires no tools beyond opening the case. Backward compatibility with 2133MHz and 2400MHz systems allows the module to downclock automatically if the platform demands it. One DIMM per slot leaves remaining channels free for further expansion.

How it compares

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

Price $48.99
Cheaper than about 78% 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 $6.12 per GB
Cheaper than about 64% of the 20,941 comparable items (median $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 number2U6D41R808 GB
Total capacity8 GB
Product type288-Pin DDR4 Non-ECC UDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportNo
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsQNAP TS-h1277XU-RP
QNAP TS-h1677XU-RP
QNAP TS-h2477XU-RP
QNAP TS-h977XU-RP

Other versions of this model

5 more in the same range

Questions about this item

How do I install this 288-pin DDR4 UDIMM in my QNAP TS-h1277XU-RP and what step is often missed?

Power off the NAS, open the chassis, align the notch on the module with the slot key, press firmly until both retention clips click, then verify the new 8 GB appears in the system BIOS before closing the case.

What maintenance or replacement will this non-ECC 1Rx8 module need over time?

No scheduled maintenance is required; the module has no heat spreader or moving parts, so replacement is only necessary if a memory test reports errors or capacity needs increase.

What limit appears first when this CL19 2666 MHz stick runs sustained workloads?

The CAS latency of 19 cycles at 2666 MHz sets the response-time floor, so latency-sensitive tasks hit that timing ceiling before bandwidth or voltage limits become a factor.

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