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Green circuit board with black chips, no heat spreader, 288 gold pins, DDR5 UDIMM module

NEMIX RAM

NEMIX RAM 16GB DDR5 4800 CL40 1Rx8 1.1V 288-pin UDIMM memory upgrade for QNAP TS-H1277AXU-RP

SKU CH-20V3-X6FBY

16 GB DDR5 module at 4800 MHz, CL40, 1.1 V, 288-pin UDIMM for QNAP TS-H1277AXU-RP NAS

  • Total capacity16 GB
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeUnbuffered
  • Rated voltage1.1 V

Capacity 16GB

  • 16 GB DDR5 4800 MHz adds responsive capacity for QNAP TS-H1277AXU-RP NAS
  • CL40 CAS latency keeps data access tight under sustained workloads
  • 1 V operation reduces power draw and heat in dense enclosures
  • 1Rx8 single-rank layout simplifies memory controller timing
  • 288-pin UDIMM form factor fits the validated QNAP slot exactly

16 GB DDR5 4800 module for QNAP TS-H1277AXU-RP

This 288-pin UDIMM delivers 16 GB of DDR5 memory at 4800 MT/s with CL40 latency and 1.10 V operation. It is built as a single-rank 1Rx8 unbuffered non-ECC module using major OEM DRAM chips. The stick is validated specifically for the QNAP TS-H1277AXU-RP NAS platform.

Suits administrators expanding that exact NAS model

Buyers who need ECC error correction should look elsewhere because this module is non-ECC. Systems requiring registered or buffered DIMMs cannot use this unbuffered design. Anyone targeting a different motherboard or NAS chassis must verify compatibility independently.

Single module supplied without heat spreader

The package contains only the 16 GB UDIMM itself; no additional brackets, cables or software licences are included. Installation relies on the standard DIMM slots of the host system. The bare PCB keeps the profile low for tight NAS enclosures.

How it compares

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

Price $199.99
Cheaper than about 58% 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 $12.50 per GB
Pricier than about 58% 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 nameNEMIX RAM
Product lineQNAP NAS Compatible Series Memory
Model nameQNAP DDR5 4800 MHz Non-ECC Unbuffered UDIMM NAS Memory
Part numberMD38400-618K1
Total capacity16 GB
Product type288-Pin DDR5 UDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL40
ECC supportNo
Buffer typeUnbuffered
Heat spreaderNo
Memory rank1Rx8
Power
Rated voltage1.1 V
Compatibility
Compatible systemsQnap
In the box
Included items16 GB (1 × 16 GB) DDR5 4800 MHz PC5-38400 1Rx8 1.1 V CL40 288-PIN Non-ECC Unbuffered UDIMM

Other versions of this model

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Questions about this item

My QNAP TS-H1277AXU-RP has four DDR5 slots — can I add this single 16 GB stick to the modules already installed?

Yes, the module is a standard 288-pin DDR5 UDIMM, so it fits any empty slot; the NAS will run all populated slots at the lowest common speed and latency.

The NAS currently runs DDR5 at 4800 MHz CL40 — will this stick match those timings without manual BIOS changes?

The stick is rated 4800 MHz CL40 at 1.10 V, exactly the same JEDEC profile the system uses by default, so it will operate at those settings automatically.

After installation, how can I confirm the new 16 GB module is recognised and running at 4800 MHz?

Open the QNAP web interface, go to System Information → Hardware, and verify the total memory shows the added 16 GB and the memory speed reads 4800 MHz.

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