This Crucial CT2K16G4DFD8266 is a kit of two 2G x 64-bit (16GB) DDR4-2666 / PC4-21300 CL19 SDRAM, 2Rx8, Non-ECC memory module, based on sixteen 1Gx8-bit FBGA components. Total kit capacity is 32GB. The SPD is programmed to JEDEC standard latency DDR4-2666 timing of 19-19-19 at 1.2V.