Never Used. The Crucial Pro 256 GB DDR4 kit consists of 8 modules, each with a capacity of 32 GB, for a total capacity of 256 GB. These modules have a bus speed of PC4-25600 (DDR4-3200) and a memory clock latency of CL22. With a UDIMM form factor and a voltage of 1.2 V, this DDR4 SDRAM kit is designed for high performance and reliability in a variety of computing applications. The Crucial brand is known for its quality and compatibility, making this kit a reliable choice for enhancing the memory capacity of your system.