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Completely new to OCing, having some problems with the voltage

post #1 of 4
Thread Starter 
Hey there,

I'm new to both overclocking and this forum, so let's see how this goes.

I yesterday overclocked my E8400 CPU to 3.2 Ghz doing the usual stuff: I increased the host frequency to 350 mhz, set the FSB:DRAM ratio to 1:1, set the PCI-E frequency to 100 and disabled the Speedstep (EIST) and C1E features temporarily for stability testing. But I wasn't sure about the CPU voltage, so I set it to Auto. However, when on Auto, CPU-Z gives me a vcore of 1.28v, which seems to be too high for the current speed of the CPU.

So I checked the VID value on CoreTemp, which I understand shows the "standard" voltage for the CPU, and it gave me 1.225v. So I went into the BIOS and set the "CPU Voltage" to 1.225v. So far so good. But now, CPU-Z is telling me that my vcore is around 1.18v, even when it's under load and when I'm running Intel Burn Test, despite the fact that I set the voltage to 1.225v. Also, under these circumstances, the CPU passed the Burn Test successfully with 10 runs under the Standard setting.

So, overall, there are four questions bugging me:

1- Is it normal for the vcore to be lower than the voltage I set in the BIOS, even under load?

2- Is the VID value the absolute minimum voltage you must set for your CPU, or can you go lower than that?

3- Seeing that it passed the Intel Burn Test, can I say that the CPU is not undervolted?

4- Finally, with the voltage values as they are now, can I eventually go up to 3.6 Ghz as long as the temps are not too high?

Thanks, everyone. I know it's a bit long, but I'd appreciate the help.
post #2 of 4

1- Is it normal for the vcore to be lower than the voltage I set in the BIOS, even under load?

 

A little bit of vdroop is fairly normal, and it's within a safe amount so don't worry.


2- Is the VID value the absolute minimum voltage you must set for your CPU, or can you go lower than that?

 

The VID is just the stock voltage, so going under that might cause it to be unstable if you go too far.


3- Seeing that it passed the Intel Burn Test, can I say that the CPU is not undervolted?

 

Well you may want to do more runs to be sure, because 10 runs doesn't really take long. Do about 25, and if it passes that then it should be solid.


4- Finally, with the voltage values as they are now, can I eventually go up to 3.6 Ghz as long as the temps are not too high?

 

Yes, most likely as your vcore isn't that high yet so there's more room to go. (Whether or not your chip is actually capable is a different matter, but you can only try and see)

post #3 of 4
Thread Starter 
Thanks. So if the OC is stable in the stress tests, the "vdroop" does not cause a problem such as a drop in overall performance and such?
post #4 of 4
Quote:
Originally Posted by Athawolfus View Post

Thanks. So if the OC is stable in the stress tests, the "vdroop" does not cause a problem such as a drop in overall performance and such?

 

 

Correct. vdroop is normal, and you can't really do much about it unless you mod your motherboard but in the end there's no performance hit.

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