BLS8G4D26BFST is a 16GB DDR4 dual rank desktop module that operates at speeds up to 2666 MT/s and has a CL16 latency. It is an Unbuffered DIMM. It conforms to the industry standard DDR4 UDIMM layout of 288 pins and is compatible with systems that take DDR4 2666MT/s UDIMM memory.