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Two green DDR5 UDIMM modules without heat spreaders

NEMIX RAM

NEMIX RAM 64GB (2x32GB) DDR5 4800 CL40 1.1V UDIMM memory upgrade for QNAP TS-H1677AXU-RP

SKU CH-YDKY-JZ7PS

A 64 GB DDR5 4800 CL40 kit of two 32 GB unbuffered UDIMMs built for the QNAP TS-H1677AXU-RP NAS

  • Capacity64GB (2 x 32GB)
  • SpeedDDR5 4800 (PC5 38400)
  • ECCNo
  • Buffered/RegisteredUnbuffered
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • Voltage1.10V

Capacity 64GB 2X32GB

  • 64 GB kit expands NAS capacity for demanding workloads
  • DDR5 4800 MT/s speed accelerates data throughput
  • CL40 latency at 1.1 V balances responsiveness with efficiency
  • 288-pin UDIMM form factor fits QNAP TS-H1677AXU-RP slots
  • Dual-rank 2Rx8 organisation optimises memory density per channel

Compatible QNAP NAS upgrade

This 64 GB kit uses two 32 GB DDR5 UDIMM modules built for the QNAP TS-H1677AXU-RP. Each stick runs at 4800 MT/s with CL40 latency at 1.1 V. The unbuffered non-ECC design matches the system's memory controller. Major-brand DRAM from Samsung, Micron or Hynix is used throughout.

NAS administrators and home-lab builders

The kit suits anyone expanding the TS-H1677AXU-RP to its supported capacity with validated modules. It is not for systems that require registered or ECC memory. Builders needing heat spreaders or lower CAS latency should look elsewhere. The 288-pin form factor will not fit laptops or small-form-factor boards that use SO-DIMM slots.

Sustained workload behaviour

Modules are stress-tested under load before shipping to verify stability during long file transfers, virtualization tasks or backup jobs. The 1.1 V operating voltage keeps power draw modest during continuous operation. No heat spreader is fitted, so adequate chassis airflow is required to maintain temperatures during extended heavy use.

Highlights

  • 64 GB kit expands NAS capacity for demanding workloads
  • DDR5 4800 MT/s speed accelerates data throughput
  • CL40 latency at 1.1 V balances responsiveness with efficiency
  • 288-pin UDIMM form factor fits QNAP TS-H1677AXU-RP slots
  • Dual-rank 2Rx8 organisation optimises memory density per channel

Specifications

BrandNEMIX RAM
SeriesQNAP NAS Compatible Series Memory
ModelQNAP DDR5 4800MHZ Non-ECC Unbuffered UDIMM NAS Memory
Part NumberMD38400-328K2
Capacity64GB (2 x 32GB)
SpeedDDR5 4800 (PC5 38400)
ECCNo
Buffered/RegisteredUnbuffered
ChipsetMajor OEM Samsung, Micron, Hynix
Voltage1.10V
Compatible SystemQnap
CAS LatencyCL40
Heat SpreaderNo
Type288-Pin DDR5 UDIMM
Rank2Rx8
FeaturesDDR5 Non-ECC Unbuffered UDIMM Motherboard Compatible
Package Content64GB (2X32GB) DDR5 4800MHZ PC5-38400 2Rx8 1.1V CL40 288-PIN Non-ECC Unbuffered UDIMM KIT

Other versions of this model

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Questions about this item

Does my QNAP TS-H1677AXU-RP need any specific BIOS setting or firmware version before I install these 4800MHz CL40 modules?

The kit is validated for the QNAP TS-H1677AXU-RP; install the two 32GB UDIMMs into the available DDR5 slots and the system will recognise the 64GB capacity at 4800MHz without extra configuration.

Will the 1.10V 2Rx8 DDR5 UDIMMs run stably if I leave any factory-installed memory in the other slots?

The NAS uses DDR5 architecture, so any existing modules must also be DDR5; matching speed and voltage helps stability, but the kit operates at its rated 4800MHz CL40 regardless of other populated slots.

How can I confirm the kit is running at 4800MHz CL40 after installation?

Open the QNAP administration interface, go to System Information or Resource Monitor, and verify the memory shows 64GB total, DDR5 4800MHz, and CAS latency 40.

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