The speed of the CPU is determined by the base clock multiplied by the multiplier.
ie. The PentiumDualCore E5200 is clocked at 2.6GHz, or 2600MHz.
The base clock is 200MHz, and the multiplier is 13x...so 200 * 13 = 2600MHz
Cache is basically the memory/RAM for the CPU and exclusively used by the CPU. It is located in the CPU chip.
So how does one find out the base clock speed and the multiplier?