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Vcore not being reported correctly..i think

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eojinlim

Senior member
Here is my situation. The vcore I set in BIOS is 0.05v MORE than actual vcore as shown in cpu-z and pc probe.

I am pretty sure the vcore stated in pc probe and cpu-z is correct because the temperatures seem just about right at those vcore.

For example. I set vcore in BIOS as 1.35 but in actuality, it is actually 1.30. The temperatures are 30C/55C (idle/load) and that seems to be the sort of temperature everyone is getting with a good hsf.

What I am wondering about is why the discrepancy and should I be particularly alarmed by this?
 
You're probably seeing "vdroop". Intel specifies that as the amount of current used by the processor increases, the vcore should decrease. So if you were to run a program like P95, the vcore should drop even more.
 
Should I be worried about vdroop and if so, what would be the absolute delta change my cpu can tolerate?

Edit:At the moment, my vcore drops from 1.304 to 1.272 with my e6300 overclocked to 3.44ghz.

I got exceptionally lucky in getting an e6300 that does not require as much vcore to overclock.

 
So if I was setting my vcore in BIOS at 1.325 (stock voltage) but it reports it as 1.275, what is the correct vcore? I want to run my system at default voltage but when i do set it at 1.325 it goes down to 1.275 even without overclocking.

According to cpu-z, my vcore is being reported as 1.320 when my e6300 is overclocked to 3300mhz.
So is my voltage at 1.370 or 1.320?

Would I do any harm if I put more voltage into my processor? More specifically, should i set in BIOS vcore of 1.500 because the actual voltage (in cpu-z) is the "safe" maximum of 1.45 and overclock like that or should I set BIOS vcore at 1.45 and just overclock like that?

Ultimately, I want to see my maximum overclock at 1.45 and I do not know exactly what to set my vcore at in BIOS.
 
It's a combination of vDroop and a CPU-Z error. CPU-Z doesn't report C2D voltages correctly.

That being said, the voltage you set in the BIOS is really around .03/4v lower at load. If you're interested, there are resistors on the motherboard you can short out with a pencil to "fix"(...it's a pointless safety feature implemented by Asus) this problem.
 
Oh, so basically, what I set in BIOS is the actual voltage and the voltage that i see on cpu-z is incorrect reporting of the vcore? I am not sure if cpu-z is reporting it incorrectly because Asus PC Probe reports the same voltage on IDLE.

So should I just follow the vcore I set in BIOS? I've been making a chart tracking my overclocking and I was getting a little worried about my voltage.

 
I've seen this happen with a friend's A64 rig. CPU-Z is reporting the vcore incorrectly. The CPU had a default 1.35v, and even setting the vcore in BIOS to 1.4v, CPU-Z would still show something around ~1.3v. But booting into the BIOS and going to "PC Health" showed the correct BIOS Vcore.
 
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