Question

Since the size of cache is always smaller than the size of the main memory, the sum of bits of the offset and index of a cache will be less than the number of bits in an address of the main memory. What do we do to the left-over bits from the address

Answer 1

because cache memory is costlier than main memory and physical size of cache memory also matters.ignoring the cost , if we use large cache memory, it will take larger physical space.so mother board won't be able to accomodate it