CPU-Z not reporting same voltage as CPU Voltage

vwgolfman · 15 Jan 2010 at 16:11

Hi,
In my P6T SE's BIOS I have set my "CPU Voltage" to 1.225V

CPU-Z indicates that it is 1.216V
When I view the BIOS' "Hardware Monitor" page it also indicates 1.216V

Thinking it might be something to do with Speedstep I disabled it. Still the same.

Does anybody know why this difference exists?

Many thanks

PaulyD · 15 Jan 2010 at 17:46

vdrop, if you also put CPU under load it will drop further down, that is vdroop.

vwgolfman · 15 Jan 2010 at 18:04

Thank you.

I had read about VDrop and I am surprosed at its effect even while navigating around the BIOS. That has to the lowest possible loading for the CPU other than the machine being turned off!

VTR · 15 Jan 2010 at 18:49

Vdrop is the difference between the voltage you set in the bios and the actual voltage, irrelevant of load.

Vdroop is the difference between the voltage at idle and under load.

lemzip · 15 Jan 2010 at 18:56

what board do you have? On Asus boards (new AN3) there is a option to set the loadline calibration helping with vdroop/vdrop

edit: sorry, seen the board you have, does it have a option called loadline calibration?

DavyBoy · 15 Jan 2010 at 18:59

LLC won't help with Vdrop, it does improve Vdroop though..

Big.Wayne · 15 Jan 2010 at 19:53

vwgolfman said:
CPU-Z indicates that it is 1.216V

When I view the BIOS' "Hardware Monitor" page it also indicates 1.216V

Consider that as the processor set at 1.216Vcore then!

As you noticed the figure from BIOS health options and the figure from CPU-z match up! . . . . use the figure in the BIOS as feedback when you aiming for a certain vCore . . .i.e keep dialling the vCore until the BIOS health options readout confirms you got the intended figure . . . take no notice of what actual setting your dialling in as the resulting figure is what your getting . . . i.e if you need to dial in 1.6vCore to achieve 1.45vCore don't sweat it . . your not actually hitting the chip with 1.6vCore!

. . . . also tell other people the figure you see in CPU-z/BIOS Health Menu and not what you actually set! :cool:

VTR · 15 Jan 2010 at 22:58

Big.Wayne said:
Consider that as the processor set at 1.216Vcore then!

As you noticed the figure from BIOS health options and the figure from CPU-z match up! . . . . use the figure in the BIOS as feedback when you aiming for a certain vCore . . .i.e keep dialling the vCore until the BIOS health options readout confirms you got the intended figure . . . take no notice of what actual setting your dialling in as the resulting figure is what your getting . . . i.e if you need to dial in 1.6vCore to achieve 1.45vCore don't sweat it . . your not actually hitting the chip with 1.6vCore! . . . . also tell other people the figure you see in CPU-z/BIOS Health Menu and not what you actually set!

+ good advice