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

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.