Cache Memory L1 cache is on-chip L2 cache is off-chip several years ago L3 cache can be off-chip or on-chi CPU looks first for data in L1, then in l2 then In main memory Hold frequently accessed blocks of main memory are in caches6 Cache Memory • L1 cache is on-chip • L2 cache is off-chip several years ago • L3 cache can be off-chip or on-chip • CPU looks first for data in L1, then in L2, then in main memory – Hold frequently accessed blocks of main memory are in caches