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Green circuit board with black memory chips and gold edge connectors

OWC

OWC 16GB DDR4 2400 CL17 2Rx8 288-pin 1.2V Non-ECC UDIMM memory upgrade

SKU CH-7FKD-NZMQX

A 16 GB DDR4 2400 CL17 UDIMM module tested for QNAP TS-1273U-RP, TS-1277, TS-1635AX, TS-1673U and TS-1673U-RP systems

  • Total capacity16 GB
  • Rated speedDDR4 2400 (PC4 19200)
  • CAS latencyCL17
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 16 GB DDR4 2400 CL17 boosts NAS responsiveness
  • 288-pin 1.2 V UDIMM fits listed QNAP models
  • JEDEC and RoHS compliant for warranty-safe upgrade
  • Backward compatible with 2133 MHz systems
  • Replaces QNAP RAM-16GDR4A0-UD-2400 and RAM-16GDR4A1-UD-2400

16GB DDR4 UDIMM for QNAP NAS

This 16GB DDR4 2400 CL17 module is built as a single 288-pin non-ECC unbuffered DIMM rated at 1.2V. It replaces QNAP part numbers RAM-16GDR4A0-UD-2400 and RAM-16GDR4A1-UD-2400 and is validated for the TS-1273U-RP, TS-1277, TS-1635AX, TS-1673U and TS-1673U-RP.

Check your NAS model and slot count

Confirm that your unit is one of the five QNAP models listed above before ordering. The module uses the standard 288-pin DDR4 UDIMM form factor and runs at 2400MHz with backward compatibility to 2133MHz. Systems requiring ECC or registered memory cannot use this stick.

Thermals noise and power in normal use

Operating at the JEDEC standard 1.2V, the module draws minimal power and runs without a heat spreader. Passive cooling inside the NAS chassis is sufficient for typical workloads. The stick adds no audible noise and keeps thermal contribution low in multi-bay configurations.

How it compares

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

Price $76.99
Cheaper than about 71% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $4.81 per GB
Cheaper than about 79% 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 number2U4D42R816 GB
Total capacity16 GB
Product type288-Pin DDR4 Non-ECC UDIMM
Performance
Rated speedDDR4 2400 (PC4 19200)
Memory
CAS latencyCL17
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsQNAP TS-1273U-RP
QNAP TS-1277
QNAP TS-1635AX
QNAP TS-1673U
QNAP TS-1673U-RP

Other versions of this model

5 more in the same range

Questions about this item

Does the box contain only the single 16GB DDR4 2400 CL17 2Rx8 UDIMM or are extra parts included?

The package contains one 16GB DDR4 2400 PC4-19200 CL17 2Rx8 288-pin 1.2V Non-ECC UDIMM module. No additional cables, brackets or heat spreaders are supplied.

Should I pick the 16GB 2400 CL17 2Rx8 version or a different capacity for my QNAP TS-1673U?

This module is a 16GB 2400 CL17 2Rx8 UDIMM that replaces QNAP part numbers RAM-16GDR4A0-UD-2400 and RAM-16GDR4A1-UD-2400. Choose it when your TS-1673U needs a single 16GB stick at that speed and rank.

Will the PC4-19200 2400MHz rating actually run at 2400MHz in a TS-1277 or drop to 2133MHz?

The module is rated PC4-19200 2400MHz CL17 and is backward compatible with 2133MHz. In a TS-1277 it will operate at the highest speed the system supports, up to 2400MHz.

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