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CPUz or Bios voltage?

post #1 of 9
Thread Starter 
I have my cpu voltage set to 1.35 in my bios. but cpuz only shows it at 1.29-1.31.

What is correct.

thanks
    
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post #2 of 9
CPU-Z is giving an accurate reading of your voltage. The lower voltage is a result of vdroop. Not entirely sure, but I think it's suppose to protect your CPU from overvoltage. That reading will also lower more once you put that CPU on load. People don't like when this happens as it can cause overclocking instability so they do what they call "vdroop pencil mod" which causes the voltage to drop by only a little. This let's you put your voltage at a lower rating as you won't have to create a cushion on where vdroop will drop your voltage resulting in less heat when idle. I myself have not done this as there is a risk in damaging your board if your not careful.
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post #3 of 9
CPU-Z is correct for me. When I set the voltage and then go back into the BIOS, I am lucky enough to see the voltage I chose, and then the actual voltage it's at due to vdrop. I can also check the BIOS System Monitor to see the voltages.

When I check CPU-Z, the voltage matches what BIOS was showing for the actual. And I'd just like to mention that I also did the vdroop mod so that when it's under full load, the voltage doesn't drop (I'm surprised that it was so easy to make the voltage 100% stable. I thought for sure that there'd still be a tiny bit of vdroop, but there's absolutely none that cpu-z can detect!).

So, vdrop is when you set the voltage and it's lower than what you set it at. Vdroop is when the voltage droops under full load. This is supposed to happen, but as overclockers, we don't like it. hehe
post #4 of 9
You aren't going to know for sure unless you use a multi-meter to measure the actual voltages so you can't entirely trust either of those. However if that 1.29-1.31 is what you are getting under load then it's completely normal, it's called vdroop and every board has it to one extent or another. If that is at idle then it's possible that the board simply overvolts, maybe somebody with a Maximum Formula could give you some better insight with their knowledge of the board.
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post #5 of 9
Ahhhh didnt read right and now my post is incorect xD. Yeah, as the others have said, vdrop
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post #6 of 9
I need to learn to edit my posts before I submit them. lol I'm sorry about that.
post #7 of 9
Quote:
Originally Posted by 5CheeseLasagna View Post
I need to learn to edit my posts before I submit them. lol I'm sorry about that.
Lol, hi-five to failing at posting xD
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post #8 of 9
Thread Starter 
Quote:
However if that 1.29-1.31 is what you are getting under load then it's completely normal
thats at idle. I will test under load is 1.27-1.28 under cpuz.

so I really should put in like 1.4 and see if it is at 1.35 or something huh.
    
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post #9 of 9
Quote:
Originally Posted by msheabel View Post
thats at idle. I will test under load is 1.27-1.28 under cpuz.

so I really should put in like 1.4 and see if it is at 1.35 or something huh.
Yep. Make a mental note of the exact vdrop you get, and then you'll know exactly where you're setting the voltage when you're in BIOS (you'll know where it will end up according to CPU-Z).

And then take note of how much vdroop you get when it's under full load. See, the thing we don't like about vdroop is that when it's under full load, the voltage may droop to a level that will cause instability. So, thus the voltage must be increased to compensate. But the problem with this compensation is increased voltage 24/7, increased heat, and a slightly, albeit likely unnoticeable, decrease in the life expectancy of the cpu chip.

So, we like to do vdroop mods (using the lead of a #2 pencil to connect two points on top of a specific transistor) to reduce the vdroop, and hopefully eliminate it. The problem with this is we must be careful as this can cause the voltage to go up on full load instead of down (so we just rub a little bit of lead off the transistor with our finger!)

I don't know if this is true or not, but I believe I was lucky that I succeeded in completely eliminating the vdroop on this mobo. Everyone told me that it's really easy to eliminate it, but I like to think that I was just lucky!
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