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Four green DDR4 UDIMM modules without heat spreaders

NEMIX RAM

NEMIX RAM 64GB (4x16GB) DDR4 2666 CL19 1.2V 288-Pin UDIMM memory upgrade

SKU CH-NCXB-5KW5G

A 64 GB DDR4 2666 kit of four 16 GB UDIMMs at CL19 and 1.2 V for ASUS desktop boards

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • 64 GB kit expands desktop capacity for demanding workloads
  • DDR4 2666 speed matches motherboard spec for stable operation
  • CL19 latency at 1.20 V keeps power draw low
  • 288-pin UDIMM form factor fits standard desktop DIMM slots
  • Four 16 GB modules populate all channels for balanced bandwidth

ASUS DDR4 2666 64GB kit

This NEMIX RAM kit supplies 64GB of DDR4 2666 memory in four 16GB UDIMM modules. It is built for ASUS motherboards that accept non-ECC unbuffered DDR4 at 1.2V. The CL19 timing and 2Rx8 organisation suit general desktop workloads and light workstation tasks.

DDR4 2666 speed ceiling

The DDR4 2666 (PC4-21300) interface caps transfer rate at 2666 MT/s regardless of faster modules installed. Maximum capacity is limited by the motherboard's slot count and memory controller. Without a heat spreader, sustained heavy loads may throttle sooner than on heatsinked kits.

Check ASUS board DDR4 slot count

Verify the motherboard has four DDR4 UDIMM slots and supports 64GB total at 2666 MT/s with non-ECC unbuffered 2Rx8 modules. Confirm the BIOS recognises 16GB density per slot. Mixed-rank or ECC memory will not work in this configuration.

How it compares

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

Price $372.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (4 × 16 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $5.83 per GB
Cheaper than about 67% 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 lineASUS Server Motherboard Compatible Series Memory
Model nameASUS DDR4 2666 MHz Non-ECC Unbuffered UDIMM
Part numberMD21300-628K4
Total capacity64 GB (4 × 16 GB)
Product type288-Pin DDR4 UDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportNo
Buffer typeUnbuffered
Heat spreaderNo
Memory rank2Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsASUS
In the box
Included items64 GB (4 × 16 GB) DDR4 2666 MHz PC4-21300 2Rx8 1.2 V CL19 288-PIN Non-ECC Unbuffered UDIMM KIT

Questions about this item

Should I choose the 4x16GB kit or a different capacity for my ASUS system?

This kit provides 64GB total across four 16GB modules, matching the 288-pin DDR4 UDIMM slots on compatible ASUS motherboards.

What does the 2666MHz speed mean for real-world desktop performance?

The modules run at DDR4 2666 (PC4-21300) with CL19 latency at 1.20V, delivering standard JEDEC throughput for everyday workloads and multitasking.

Is this memory limited by the DDR4 UDIMM interface on my motherboard?

Yes, the 288-pin unbuffered non-ECC UDIMM format caps operation to the DDR4 2666 standard supported by the ASUS platform.

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