Quote Originally Posted by sesdave View Post
Anyone know if there is a known problem on this board on the CPU temperature sensor monitoring. My Speedfan CPU reading has been suddenly jumping from about 38c idle up into the 80-90's whilst still showing core0 and core1 temps at about 22c.? This is whilst not running anything in particular. Yes - I have checked the HSF and it fine.
Get a second opinion! Try one or more other apps to see if you get the same results. That will tell you if SpeedFan has gone nuts or you need to check that HSF again.

Quote Originally Posted by sesdave View Post
Also appreciate if anyone can tell me exactly what the CPU PLL voltage setting in BIOS is for.
PLL - Phased-Locked Loop

the phase-locked loop block is a feedback control system that automatically adjusts the phase of a locally generated signal to match the phase of an input signal. PLLs operate by producing an oscillator frequency to match the frequency of an input signal. In the locked condition, a slight change in the input signal first appears as a change in phase between the input signal and the oscillator frequency. This phase shift then acts as an error signal to change the frequency of the local PLL oscillator to match the input signal.
This is my guess. Somewhere on that motherboard is a circuit that is trying to maintain a constant CPU voltage and this option allows us to adjust the voltage to that circuit. Any second opinions on that?