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 GroveStudies Production: Cache memory Cache memory, also called cache, supplementary memory system that temporarily stores frequently used instructions and data for quicker processing by the central processing unit (CPU) of a computer. Levels of memory: Level 1 or Register – It is a type of memory in which data is stored and accepted that are immediately stored in CPU. Most commonly used register is accumulator, Program counter, address register etc. Level 2 or Cache memory – It is the fastest memory which has faster access time where data is temporarily stored for faster access. Level 3 or Main Memory – It is memory on which computer works currently. It is small in size and once power is off data no longer stays in this memory. Level 4 or Secondary Memory – It is external memory which is not as fast as main memory but data stays permanently in this memory. The performance of cache memory is frequently measured in terms of a quantity called Hit ratio. Hit ratio = hit / (hit + miss) =