The Intel Core Duo has two cores , 2 Mebibytes of L2 cache for both cores , and an arbiter bus that controls the L2 cache and front side bus access . Intel Core Duo ( product code 80539 ) consists of two cores on one die , a 2 MB L2 cache shared by both cores , and an arbiter bus that controls both L2 cache and FSB ( front-side bus ) access .