What is the definition of external speed?

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?

So how does one find out the base clock speed and the multiplier?

Download CPU-Z, it's a program that tells you your computer's CPU type and CPU clock speed and multiplier.

Thanks for the information on internal speed.

So how does one find out the base clock speed and the multiplier?

Thanks for the information on internal speed.