CT16G4DFRA266 is a 16GB DDR4 desktop module that operates at speeds up to 2666 MT/s and has a CL19 latency. It is an Unbuffered UDIMM and can be built either single-ranked or dual-ranked. It conforms to the industry standard DDR4 UDIMM layout of 288 pins and is compatible with systems that take DDR4 2666 MT/s UDIMM memory.