In computer memory family Fasted memory is Cache memory which have limited size in CPU Chip. This type of memory is . Some CPU have cache memory 1mb,2mb and 3 mb which enough to runs all the taks from CPU. Cache memory is usually initialized directly to the CPU and is used to Cache instructions that are frequently accessed by the processes that are currently running. Although a RAM cache is much faster than a disk-based cache, cache memory is much faster than a RAM cache because this memory is intermediate Microprocessor and CPU chip.