Crucial BLS8G4D26BFSB is a 1Gx64-bit (1x 8GB) DDR4-2666 CL16 Non-ECC Unbuffered memory module, based on eight 1G x 8-bit DDR4 FBGA components. The SPD is programmed to JEDEC standard latency DDR4-2666 timing of 16-18-18 at 1.2V. This UDIMM uses gold contact fingers.