** Official ** Gigabyte UD3 P45 Series -- EP45-UD3 / EP45-UD3R / EP45-UD3P

[Loco23]

if i move the setting to say 20c,does that mean once it goes above 20c the temp sensor will move?

No.
From MCHTemp's FAQ:
The sensor is not able to measure the temperature below a certain value (hereafter Tmin). Tmin depends on the specific chip, and typically lies in the range of 40 to 50 ° C, but in rare cases can reach 66 ° C. Tmin can not be determined programmatically, so MCHTemp considers it equal to 50 ° C.

With Vista maybe some problem, one moment please