CPU voltage dropping in Windows - Solution?

OzZie

OzZie

OzZie

Soldato
Joined
9 Jul 2004
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Nottingham
Hi,

I'm trying to overclock my Q6600 G0 to around 3.4-3.6. I have a 1.3250v VID chip which isn't great, but I've got a decent cooler and a good case with loads of fans, so temperatures aren't too much of an issue at the moment.

However, i think a possible cause to my problems is the fact that the CPU voltage i set in the BIOS doesn't actually show up in Windows. It's set at the moment to 1.4250v, but software is reporting it as 1.40v, which when overclocking is quite a gap.

Which do i believe?
Is there anything in the BIOS (P5Q Pro) i can change?

Thanks.

*Speedstep and C1E are disabled also. :)
 
This is perfectly normal and is known as vdrop and vdroop,

Taken from the official ocuk beginners overclocking guide.

Vdrop
Vdrop is the difference between the selected voltage in the BIOS and the actual idle voltage, typically this is about 0.05V though new P35 boards seem to be a lot less affected by it. THIS IS NOT Vdroop

Vdroop
Vdroop is the difference between idle voltage and load voltage. The droop is actually related to the current draw of the CPU and is a peculiarity of Intel CPU design specs and as such AMD setups don't suffer from it to any great deal. Vdroop gets progressively worse as load more cores up on multicore CPUs. Some recent P35 boards now have the option in the BIOS to override the circuit in the motherboard power circuitry to pratically eliminate Vdroop. Other boards can usually have it overriden by a simple pencil mod, or with the addition of an extra resistor by soldering. 680i boards are notorious for high Vdroop with quad cores.

The asus p5q boards have a feature called load line calibration (LLC) which can lessen this.
 
You know if i set the voltage to 1.3250v CPU in the bios, but in Windows it shows as 1.30v, does this mean that windows is displaying the correct values, or that Windows is not accurately reporting them, and that the bios is always correct. Even the bios is reporting a significant change in voltage (monitor page).

My VID is 1.3250v, and that is what it is set to in the bios, so i should be ok? Is 1.4v in the bios 1.4v in reality?

Thanks. :)
 
I have a setting in my bios called load-line calibration, enabling this feature adjusts Vdroop,keeping the cpu voltage more constant under light and heavy cpu load.
 
At the moment, it defaults to auto, but there are also enable and disable options for it :confused:

Will try them both out and see if it makes any difference. :)
 
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