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Green printed circuit board with black memory chips and gold edge contacts

OWC

OWC 16GB DDR4 2400 CL17 2Rx8 UDIMM 1.2V QNAP TS-677 TS-832XU

SKU CH-137K-SR3T6

16 GB DDR4-2400 CL17 UDIMM memory upgrade for compatible QNAP NAS models

  • Capacity16GB
  • Type288-Pin DDR4 Non-ECC UDIMM
  • SpeedDDR4 2400 (PC4 19200)
  • CAS LatencyCL17
  • Voltage1.2V
  • ECCNo
  • 16GB DDR4 2400 CL17 boosts NAS responsiveness
  • Single 2Rx8 UDIMM module installs in minutes
  • JEDEC and RoHS compliant for warranty-safe operation
  • Runs at 1.2V for lower power draw
  • Compatible with TS-677 and TS-832XU series

QNAP NAS memory upgrade

This 16 GB DDR4 module is built for QNAP TS-677, TS-832PXU, TS-832PXU-RP, TS-832XU and TS-832XU-RP systems. It replaces QNAP part numbers RAM-16GDR4A0-UD-2400 and RAM-16GDR4A1-UD-2400. The single DIMM adds capacity for multitasking and larger workloads on compatible NAS units.

Low-voltage unbuffered operation

Running at 1.2 V with CL17 latency, the 288-pin UDIMM draws minimal power and generates little heat without a spreader. JEDEC-standard DDR4-2400 signalling keeps thermals and noise low in normal NAS use. Backward compatibility with 2133 MHz systems allows flexible deployment.

Warranty-safe DIY installation

OWC validates every module in-house and backs it with a limited lifetime warranty and free technical support. The advanced replacement program ships a new unit before the original is returned. No bundled software or accessories are included; the upgrade relies on the system's own memory management.

Highlights

  • 16GB DDR4 2400 CL17 boosts NAS responsiveness
  • Single 2Rx8 UDIMM module installs in minutes
  • JEDEC and RoHS compliant for warranty-safe operation
  • Runs at 1.2V for lower power draw
  • Compatible with TS-677 and TS-832XU series

Specifications

BrandOWC
Part Number2U4D42R816GB
Capacity16GB
Type288-Pin DDR4 Non-ECC UDIMM
SpeedDDR4 2400 (PC4 19200)
CAS LatencyCL17
Voltage1.2V
ECCNo
Buffered/RegisteredUnbuffered
Rank2Rx8
Heat SpreaderNo
Compatible SystemQNAP TS-677
QNAP TS-832PXU
QNAP TS-832PXU-RP
QNAP TS-832XU
QNAP TS-832XU-RP

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Questions about this item

How do I install the 288-pin DDR4 UDIMM in my QNAP TS-677, and what step is often missed?

Power off the NAS, unplug it, open the chassis, align the notch on the 288-pin module with the slot key, press firmly until both side clips click, then reseat if the system does not show the full 16GB on first boot.

What maintenance or replacement will this 16GB non-ECC module need later?

No scheduled maintenance is required; the module has no heat spreader, so keep the NAS vents clear of dust, and replace the DIMM only if memory errors appear or capacity must be increased beyond the slot limit.

What limit appears first under sustained use with this CL17 1.2V DDR4 2400 kit?

The memory controller caps throughput at the DDR4 2400 PC4-19200 rating, so sustained workloads hit the bandwidth ceiling before thermal throttling becomes a factor on this unbuffered 2Rx8 module.

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