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Haswell Overclocking Guide [With Statistics] - Page 43

post #421 of 19539
Quote:
Originally Posted by Ponteral View Post

I have one more question. About the Voltage. I mean Vcore.

I set it on 1.260V.. CPU-Z and HWinfo64bit shows 1.261V, that's I guess normal. But I'm little bit confused from HWmonitor, version 1.23.

It shows on Vcore in load 1.280V, why is it like that? Is it mistake, or is right like this? It shows also my set 1.260V but on VID. Can you explain it to me? or somebody? What is right? Thank's.

I'm trying non AVX Prime95 - version 25.11, then I will try the last version...

Don't worry about it because you can't control it. HWMonitor is the only program that I know that displays this value. The rest always display the voltage that you manually enter. I initially had this same question a month ago, and I thought that LLC had something to do with it, but it doesn't. It isn't a bad idea to keep an eye on it (and how much it varies) but ultimately you can't control it. It will always be about the same offset, at least this is the case with my system. The same is also true with cache voltage, it is always a bit higher than the value entered in BIOS. Let us know how your stress testing goes...
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post #422 of 19539
Quote:
Originally Posted by BangBangPlay View Post

Don't worry about it because you can't control it. HWMonitor is the only program that I know that displays this value. The rest always display the voltage that you manually enter.

HWInfo shows the actual Vcore also, it is just lower down in the list.


Edited by Forceman - 8/9/13 at 1:38pm
post #423 of 19539
Quote:
Originally Posted by Forceman View Post

HWInfo shows the actual Vcore also, it is just lower down in the list.


I was referring to HWMonitor's CPU Vcore value, as it is always displayed as a higher value than what you entered. I pay attention to the VID value, as that seems to be more accurate. I focus on the value I enter in BIOS because that is what I can control. HWMonitor also displays the wrong voltage for my GPU too. I have HWinfo, but I don't typically use it for monitoring, more for random info when I need it.

This would not be the first time that third party software displays the wrong values for some motherboards. Also if the user hasn't updated either program they could be getting the wrong value. So are you trying to say that HWMonitor's vcore value is actually right and my BIOS is wrong? Or are you just pointing out that there is another program that displays the same inaccurate reading? I have read that in some cases that HWMonitor's Vcore is actually the QPI/VTT voltage, or voltage being fed into the processor.
Edited by BangBangPlay - 8/9/13 at 2:27pm
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post #424 of 19539
Thanks guys,

HWinfo is the same like HW monitor. They show VID 1.260, but Vcore 1.280V. It also shows 1.260V on Vcore, it is on the minimal value... It's realy confusing...
post #425 of 19539
Thread Starter 

HwInfo displays a higher voltage than I entered, but I've just about given up now. :)

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post #426 of 19539
I was getting BSODs (0x124) while running Prime95 blend test and so I went up increasing the Vcore. Now, instead of BSODs, I'm getting rounding errros in Prime95. last time i got such errors on 3 workers (two after 2hrs, one after 3.5hrs.) rest kept running till it woke up. (ran it overnight)

could it be a difference cause now? something other than Vcore? VIN perhaps? what should i do next? any advise?

cache ratio is at 35x and voltage at 1.05V btw. VIN is at auto, must be around 1.7V (that's what the initial value is, no idea what the subsequent value is because it is now shown in bios, can only set it)
Edited by Anusha - 8/9/13 at 3:26pm
post #427 of 19539
Thread Starter 
Quote:
Originally Posted by Anusha View Post

I was getting BSODs (0x124) while running Prime95 blend test and so I went up increasing the Vcore. Now, instead of BSODs, I'm getting rounding errros in Prime95. last time i got such errors on 3 workers (two after 2hrs, one after 3.5hrs.) rest kept running till it woke up. (ran it overnight)

could it be a difference cause now? something other than Vcore? VIN perhaps? what should i do next? any advise?

cache ratio is at 35x and voltage at 1.05V btw. VIN is at auto, must be around 1.7V (that's what the initial value is, no idea what the subsequent value is because it is now shown in bios, can only set it)

What do rounding errors look like?

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post #428 of 19539
Quote:
Originally Posted by Darkwizzie View Post

What do rounding errors look like?

It just causes the worker thread to stop because it rounded incorrectly.

Example: The calculated number is 1325049.73. The core incorrectly rounds down instead of up. The worker will stop and the other workers will continue.
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post #429 of 19539
Quote:
Originally Posted by Anusha View Post

I was getting BSODs (0x124) while running Prime95 blend test and so I went up increasing the Vcore. Now, instead of BSODs, I'm getting rounding errros in Prime95. last time i got such errors on 3 workers (two after 2hrs, one after 3.5hrs.) rest kept running till it woke up. (ran it overnight)

could it be a difference cause now? something other than Vcore? VIN perhaps? what should i do next? any advise?

cache ratio is at 35x and voltage at 1.05V btw. VIN is at auto, must be around 1.7V (that's what the initial value is, no idea what the subsequent value is because it is now shown in bios, can only set it)

On Sandy at least, rounding errors meant you were closer to a stable Vcore than outright crashes. So 1.275V gives you a crash, 1.3V gives you rounding errors, and 1.325V would be stable (for example). For Ivy and Haswell I think you'll probably see WHEA errors in the error log if you check it, right around the time you got the rounding error. I'd try another slight bump in Vcore.
post #430 of 19539
Quote:
Originally Posted by Ponteral View Post

Thanks guys,

HWinfo is the same like HW monitor. They show VID 1.260, but Vcore 1.280V. It also shows 1.260V on Vcore, it is on the minimal value... It's realy confusing...

I know it can be. When you enter a manual core voltage setting in BIOS you are placing a limit on the voltage that it can reach. The only exception to this is when AVX instructions are introduced and your voltage is set to adaptive, it will go over your max, but only under these conditions. HWMonitor is known for displaying the wrong values for certain settings and it often can't support every motherboard made. Despite it claiming that it has been updated for Haswell, it wasn't designed to be used with a CPU that has an internal voltage regulator. That value represents something besides the actual core voltage on Haswell IMO and is insignificant to us anyways. It is likely that the Vcore is correct for Ivy and Sandy users but represents something else for Haswell CPUs.

Hypothetically speaking even if the Vcore was indeed the actual core voltage inside your CPU raising above your input maximum voltage, it wouldn't make a difference would it? If it fluctuated (or drooped for example) then maybe it would have some significance because it would help you set your LLC, but it offers us no benefit while OC and doesn't help us achieve stability. So I just continue to read the value that represents what I input for my voltage, or the VID value.
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