Why cpu-z show different values for the vcore?

[michaelmk86]

Hi

I have the vcore from the bios at 1.293v, but the cpu-z show different things at different load stages.

CPU-Z shows:
1.280v idle
1.296v load 100% prime95(the first 5 minutes)
1.304v load 100% after 5 minutes prime95


my settings

cpu - i7 920 D0
mobo - ASUS P6T

4095 MHz
Base clock to 195,
Vcore to 1.293v
Mem divider set to 1560
9-9-9-24
QPI/VTT auto
HT on
Turbo enabled
in prime95 75C MAX

 

[al360ex]

Hello,

It's probably because you have TurboBoost enabled. This can augment the multiplier by 1, and can modify the bclk. All in all, this means more performance, more voltage, and more heat. If this poses a problem, you can disable it in the BIOS. It could also be that you have some power-saving options activated in said BIOS. This lowers the vcore/multiplier/bclk when the CPU is not used very much, leadin to less heat and less power consumption. You can also disable these options in the BIOS.
For more info : http://www.intel.com/technology/turboboost/

Hope this helps !
al360ex

 

[jsc]

I have the vcore from the bios at 1.293v, but the cpu-z show different things at different load stages.

That's because the BIOS changes the voltage at different load stages. And anyway, 1.304 volts at load is insignificant compared to the BIOS setting. A difference of 0.1 or 0.2 volts would be significant.