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Four green circuit boards with black memory chips, no heat spreaders, 288 gold pins along the bottom edge

NEMIX RAM

NEMIX RAM ME21300-328K4 128GB (4x32GB) DDR4 2666 ECC UDIMM memory upgrade

SKU CH-31JB-JEA74

128GB kit of four 32GB DDR4 ECC unbuffered UDIMMs at 2666MHz CL19 for ASUS WS C246M PRO workstation motherboards

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered

Size 128GB 4X32GB

  • 128 GB total capacity from four 32 GB modules
  • ECC protection detects and corrects single-bit errors
  • DDR4 2666 speed with CL19 timing at 1.20 V
  • 288-pin unbuffered UDIMM fits ASUS WS C246M PRO boards
  • 2Rx8 dual-rank organisation matches controller expectations

Exact-match 128 GB DDR4 ECC kit

This NEMIX RAM kit delivers 128 GB as four 32 GB DDR4-2666 ECC unbuffered UDIMMs. It is built for workstations that require the precise 2Rx8 rank, 1.2 V voltage and CL19 timing the memory controller expects. The modules install in the standard 288-pin DIMM slots of compatible ASUS WS C246M PRO series boards.

Verified fitment for ASUS WS C246M PRO

The kit is validated for the ASUS WS C246M PRO and WS C246M PRO/SE workstation motherboards. Using the correct unbuffered ECC UDIMM form factor avoids the incompatibility that registered or SODIMM modules would cause. Matching the board's population rules lets the system recognise the full 128 GB capacity at the rated 2666 MT/s speed.

ECC protection for data integrity

On-die error-correcting code detects and corrects single-bit errors in real time, preventing silent data corruption and unplanned reboots. This hardware-level reliability is essential for workloads where calculation accuracy and uptime cannot be compromised. Buyers needing non-ECC memory or a different DDR generation should look elsewhere.

How it compares

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

Price $862.99
Pricier than about 59% 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 $6.74 per GB
Cheaper than about 59% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineNEMIX RAM Original Series Memory
Model nameDDR4 ECC Unbuffered UDIMM Memory
Part numberME21300-328K4
Total capacity128 GB (4 × 32 GB)
Product type288-Pin DDR4 ECC UDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsASUS
In the box
Included items128 GB 4 × 32 GB DDR4 2666 MHz PC4-21300 2Rx8 1.2 V 288-PIN ECC UDIMM KIT

Other versions of this model

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Questions about this item

Will the 288-pin DDR4 UDIMM modules need replacement if I later populate all four slots on the ASUS WS C246M PRO?

The kit already fills all four slots with 32 GB modules, so no further modules can be added; replacement would only be needed if a stick fails.

What limit appears first when the 2Rx8 ECC UDIMMs run at 2666 MHz continuously?

The CAS latency of CL19 and the fixed 1.20 V voltage set the timing and power ceiling that the memory controller enforces under sustained load.

How much heat and noise do the bare 1.2 V DDR4 sticks produce during all-day operation?

Without a heat spreader the modules run at standard 1.20 V DDR4 power, generating minimal heat and no audible noise since they have no moving parts.

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