A Comprehensive Guide to Understanding DIMM Slots: DIMM slots are essential to a system's functionality and performance in the world of computer hardwarrummy yes apke. A type of memory module called a DIMM, or Dual In-line Memory Module, is used in computers to provide volatile storage for data that the CPU needs to access quickly. The motherboard usually has these slots, which are made to hold DIMM modules, which are available in different sizes & configurations.