My apologies Mr software creator, i tested both balanced and full (p0 state) the readings is unstable at idle maximise. I have attached a screen shot
a)The spikes area are when i switch phenomsrtweaker to p0 and balanced.
b) The no spikes area is when i put to P1 low power settings.
Both a) and b) are with GPUZ open and maximise and PC is left idle at windows desktop, no other software running that may cause refresh to 2D images.
If i uninstall phenomsrtweaker, my cpu run at full speed P0 and the results are same as a)
If i monitor with CCC, it seem there is no spikes but since CCC update is slower than GPUZ i cannot be sure.
I must edit to say, this never happen before my GPU crashed. GPUZ can monitor with P0 state with no spikes. Strange? Seems i need reinstall windows?