CT8G4DFS8266 is a 8GB Single Ranked DDR4 desktop module that operates at speeds up to 2666 MT/s and has a CL19 latency. It is an Unbuffered DIMM . It conforms to the industry standard DDR4 ECC UDIMM layout of 288 pins and is compatible with systems that take DDR4 2666MT/s UDIMM memory.