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Four green 288-pin DDR5 UDIMM modules, no heat spreader

NEMIX RAM

NEMIX RAM 128GB (4x32GB) DDR5 4800 CL40 1.1V UDIMM ASRock Z790 PG Riptide memory upgrade

SKU CH-R3EB-FCBAW

128GB kit of four 32GB DDR5 4800 CL40 1.1V UDIMM modules validated for ASRock Z790 PG Riptide motherboards

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeUnbuffered
  • Rated voltage1.1 V
  • 128 GB total capacity across four 32 GB modules
  • DDR5 4800 speed rated at PC5-38400 bandwidth
  • Low 1.1 V operating voltage for efficient power use
  • CL40 CAS latency with 2Rx8 dual-rank organisation
  • Validated for ASRock Z790 PG Riptide motherboard compatibility

Capacity & Compatibility

This 128GB kit contains four 32GB DDR5 modules validated for the ASRock Z790 PG Riptide motherboard. It targets builders and IT professionals who need maximum supported memory capacity for workstations or high-end desktop systems running memory-intensive workloads.

Build Integration

The unbuffered non-ECC UDIMM design fits standard 288-pin DDR5 slots without requiring registered memory support. Operating at 1.10V, the kit draws minimal power while the dual-rank 2Rx8 organisation allows the memory controller to interleave accesses across all four modules for balanced throughput.

Sustained Workload Behaviour

Rated at DDR5 4800 with CL40 timings, the modules maintain rated frequency during extended compute sessions because every stick is stress-tested under load before shipping. The absence of a heat spreader relies on case airflow to keep temperatures stable during prolonged rendering, virtualisation or compilation tasks.

How it compares

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

Price $1,694.99
Pricier than about 66% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $13.24 per GB
Pricier than about 60% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineASRock Gaming Motherboard Compatible Series Memory
Model nameASRock DDR5 4800 MHz Non-ECC Unbuffered UDIMM
Part numberMD38400-328K4
Total capacity128 GB (4 × 32 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 rank2Rx8
Power
Rated voltage1.1 V
Compatibility
Compatible systemsASRock
In the box
Included items128 GB (4 × 32 GB) DDR5 4800 MHz PC5-38400 2Rx8 1.1 V CL40 288-PIN Non-ECC Unbuffered UDIMM KIT

Questions about this item

Will the CL40 latency become a bottleneck when all four slots are populated at 4800 MT/s?

The kit runs at CL40 across all four 32 GB modules at the rated 4800 MT/s; latency does not change when the board fills every slot.

How much heat do four 1.1 V DDR5 modules generate during continuous workloads?

Each module operates at 1.1 V without a heat spreader, so sustained load produces only the standard DDR5 thermal output for unbuffered UDIMMs.

Does the ASRock Z790 PG Riptide need a specific BIOS version before this 128 GB kit will post?

The kit is validated for the ASRock Z790 PG Riptide; install the modules and the board will recognise the 128 GB capacity at 4800 MT/s.

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