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Four green DDR4 UDIMM sticks, no heat spreaders, 288-pin gold contacts

NEMIX RAM

NEMIX RAM 64GB (4x16GB) DDR4 2666 CL19 ECC UDIMM 1.2V 288-pin

SKU CH-5B2K-MMX7P

Four 16 GB DDR4 2666 CL19 ECC UDIMM modules totalling 64 GB at 1.2 V for compatible ASUS Lockerstor NAS systems

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • 64GB kit with four 16GB modules for high-density server memory
  • DDR4 2666 CL19 at 1.2V balances speed and power efficiency
  • ECC unbuffered UDIMM detects and corrects single-bit errors automatically
  • 288-pin DDR4 form factor fits standard server and NAS motherboard slots
  • Built with major OEM Samsung, Micron or Hynix chips for reliability

64 GB ECC UDIMM kit for NAS servers

This NEMIX RAM kit provides 64 GB of DDR4 ECC unbuffered memory in a matched set of four 16 GB modules. It runs at 2666 MHz with CL19 latency at 1.2 V. The modules use 288-pin UDIMM form factor and are built with major OEM DRAM chips.

Suited for ASUS Lockerstor NAS upgrades.

The kit is designed for compatibility with ASUS Lockerstor AS-16GECD4-U NAS units and similar systems that accept unbuffered ECC UDIMMs. Builders whose motherboards require registered or load-reduced DIMMs cannot use this memory. Systems needing higher densities per slot or non-ECC modules should consider other configurations.

2666 MHz DDR4 speed rating

The decisive specification is the DDR4 2666 (PC4-21300) speed grade. A motherboard or NAS that only supports lower DDR4 frequencies will still run the modules, but at the slower supported rate. Verify that your platform accepts unbuffered ECC UDIMMs at this speed before purchase.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $527.99
Pricier than about 71% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB (4 × 16 GB)
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $8.25 per GB
Pricier than about 59% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineASUS LOCKERSTOR NAS Memory
Model nameASUS LOCKERSTOR NAS Memory
Part numberME21300-618K4
Total capacity64 GB (4 × 16 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 rank1Rx8
Heat spreaderNo
Power
Rated voltage1.2 V

Questions about this item

What motherboard slot does this 288-pin DDR4 kit require?

A standard 288-pin DDR4 DIMM slot running at 1.20 V is required for each of the four 16 GB modules.

Will this CL19 DDR4-2666 kit run with slower DDR4 modules I already own?

The kit operates at 2666 MT/s CL19; the motherboard will clock all installed DDR4 down to the slowest module’s speed and loosest timings.

How can I confirm the ECC function is active after installing the 4x16 GB kit?

Check the BIOS memory information page — it should show 64 GB total with ECC enabled, and the OS should report correctable error counters.

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