Cache memory is the fastest memory of computer and also called CPU memory. Cache memory is random access memory (RAM) that a computer microprocessor can access more quickly than it can access regular RAM. This type of memory is typically integrated directly with the CPU chip or placed on a separate chip that has a separate bus interconnect with the CPU. The basic purpose of cache memory is to store program instructions that are frequently re-referenced by software during operation. Fast access to these instructions increases the overall speed of the software program. All the bootstrap applications are run via Cache memory. In operating system all the micro operations are execute via the help of Cache memory.