When changing Multi's why does this happen?

[newls1]

Im using a P5BDLX board w/ an E6600 @ 3.53GHz 1.352Vcore. When ever I change my multi (ex: 8x) It shows a CPU speed that is WAY off. WHY Is there some way I can fix this? Thank you

 

[Jonsey]

What is the "it" that shows the speed as off? cpu-z, a motherboard monitor, the bios, or what?

 

[newls1]

What is the "it" that shows the speed as off? cpu-z, a motherboard monitor, the bios, or what?

everything, but BIOS.