CT2K32G48C40U5 is the Crucial 64GB kit consisting of (2) 32GB desktop modules that operate at the speed of 4800MT/s and has a CAS Latency of 40. It is an UDIMM and conforms to the industry standard DDR5 UDIMM layout of 288 pins. It is compatible with systems that can take DDR5-4800 UDIMM memory.