CACHE MEMORY

The moving data between ram and central processing unit register is one of the most time consuming operations a central processing unit must perform,simply because RAM is much slower then the central processing unit .A partial solution to this problem is to include a cache memory in the central processing unit . cache (pronounced cash) memory is similar to ram except that it is extremely fast compared to normal memory and it is used in a different way.cache memory works with the central processing unit and ram.when a program is running and the central processing unit needs to read a piece of data or program instruction from Ram.
central processing unit check the data is in cache memory.cache memory and save the time needed to load the data from Ram .cache is present in several places in a computer most hard drives and networks card have cache present to speed up data access with out cache.your computer would be much slower device .cache is often called Level-1(L1)many central processing units have much as 256 KB built in and more speed to modern central processing unit an additional cache is added to central processing units this cache is called level-2 (L2) this cache used to be found on the motherboard ceca is also added to the mother board .this mother board resident cache is now called level-3 (L3)cache is found on very end computer it is not necessary for a computer to have L3 cache.