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Four green DDR4 DIMM sticks without heat spreaders

Computer Memory Solutions

Computer Memory Solutions 64GB (4x16GB) DDR4 2666 CL19 memory upgrade

SKU CH-KMZ7-3R3Q1

64 GB DDR4 kit of four 16 GB modules running at 2666 MHz CL19 for select ASRock X299 and X399 motherboards

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL19
  • Memory timings19-19-19
  • Rated voltage1.2 V
  • 64 GB total capacity from four 16 GB modules
  • DDR4 2666 speed rated at PC4 21300 bandwidth
  • CL19 latency with 19-19-19 timing for stable operation
  • 2 V unbuffered DIMMs run without extra cooling
  • Guaranteed compatibility with listed ASRock X299 and X399 boards

64GB DDR4 kit for ASRock X299 and X399

This 64GB kit contains four 16GB DDR4 2666 modules rated at CL19 with 1.2V operation. The unbuffered non-ECC DIMMs use a 288-pin layout and are validated for the listed ASRock X299 Extreme4, X299 Killer SLI/ac, X299 OC Formula, X299 Taichi and X399 Phantom Gaming 6 motherboards.

Build integration and capacity headroom

Four modules fill every DIMM slot on these boards, delivering the full 64GB capacity in a matched quad-channel configuration. The 2Rx8 organisation runs at the rated 2666 speed without requiring ECC or registered support, leaving all four sockets occupied and the platform’s 128GB maximum still available for future upgrades if the board is repopulated with higher-density sticks.

Ideal for high-capacity workstations.

Builders who need 64GB of standard DDR4 for content creation or virtualization on the named ASRock platforms will find this kit a direct fit. Buyers who require ECC error correction, registered modules for server boards, smaller capacities for mini-ITX systems, or speeds beyond DDR4 2666 should look at other memory lines.

How it compares

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

Price $426.99
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 $6.67 per GB
Cheaper than about 59% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameComputer Memory Solutions
Model nameCM2048642666DIMM
Total capacity64 GB (4 × 16 GB)
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL19
Memory timings19-19-19
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsASRock Motherboard X299 Extreme4, X299 Killer SLI/ac, X299 OC Formula, X299 Taichi, X399 Phantom Gaming 6
In the box
Included items4 Memory RAM Sticks

Questions about this item

Will the 2666 MHz speed hold steady when all four slots run full tilt?

The kit runs at DDR4 2666 with CL19 19-19-19 timings at 1.2 V; all installed memory operates at the slowest module or CPU limit.

How much heat do four unbuffered 16 GB sticks put out in a closed case?

No heat spreader is fitted; the modules draw 1.2 V and rely on case airflow for cooling.

Which ASRock boards are confirmed for this 4 x 16 GB kit?

Compatible with X299 Extreme4, X299 Killer SLI/ac, X299 OC Formula, X299 Taichi and X399 Phantom Gaming 6.

More in Model-Specific Memory Upgrades

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