Freqy: Revhead has answered the changing multiplier question for you.

Regarding the temps, Speedfan is known to incorrectly report the temps due to an incorrect tjunction temp used to calculate the temp. This is fixed in the latest beta version of Speedfan. You will need to register on the Speedfan site if you want to use this beta.

I personally use Coretemp for monitoring the temps. 0.95.4 correctly reports temps and is stable (0.95 is known to crash on some systems).