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WARNING! Do not trust Window's Voltage readings

post #1 of 6
Thread Starter 
I have just taken some voltage readings using an accurate voltmeter in order to try and determine whether the bios or windows is better at reading system voltages. They show that you CANNOT trust windows in the slightest.

I set the Vcore at 1.525 in the bios on my DFI SLI-DR motherboard. In windows it shows up as 1.52V in both smartguardian and CPUz (remains steady at both load and idle). In the bios the reading shows up as 1.54V. However the voltmeter reads 1.55V when idle and 1.57V when on full load. That is a difference if up to .05V!

Now for the Vdimm. In the bios I set the Vdimm at 2.70V. In windows this value reads 2.7V on smartguardian (hence could be anywhere between 2.65 and 2.74ish volts), in the bios it reads 2.74V but on the voltmeter it reads 2.77V at both idle and load. A difference of 0.07V!

This just proves how unreliable both the bios and windows are at reading voltages. I thought that at 1.52V I had a fair bit of headroom left to increase the Vcore in order to increase my Overclock whilst not going past 1.60V. In actual fact it turns out that, that 0.08V gap is actually around a 0.03V gap.
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post #2 of 6
This is known to happen but isnt all that much of a threat IMO aslong as its not off by like 1 whole volt.
post #3 of 6
Thread Starter 
Good point, but I wish the readings from the voltmeter showed that the actual Vcore was lower that the other readings and not the other way round.
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post #4 of 6
what brand and model volt meter?
Quote:
difference if up to .05V!
Quote:
A difference of 0.07V!
A very small amount of voltage. That amount will never damage anything.
Surprising your meter picked it up. like to know how much your meter is worth.
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post #5 of 6
Thread Starter 
Hi, the model is called a Sinometer MS8230B, and it measure voltages to 2 decimal place/3 significant figure accuracy. You are aboslutely right about 0.07V not being a very large amount, however when we are dealing with small voltages like 1.50V, a 0.05-0.07 increase is equivalent to a 5% increase, which is quite a lot in OCing terms.
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post #6 of 6
actually 5% is 0.075 my point is that is a fraction of a fraction. And there is probably huge fluctuations in that realm of voltage.
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