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mystery of voltage

post #1 of 8
Thread Starter 
Hi Everyone!

First, I'm new, so hello. And i'm from Germany so please be generous with my english. But I'll try my best and I hope someone can help me redface.gif .
Its my first attempt to overclock, but I'm sure about my theoretical knowledge in overclocking. Its just that I can't connect the terms in theory with my computer readings.
I'm using an Abit IX38 Quad GT with an intel Q9650. I have some problems with my BIOS and with incorrect readings of mit Vcore (at least I think so).
In cpu-z 1.58 the programs shows me a CPU VID of 1,25V:

cpuz158v.jpg

Version 1.49 displays the current Vcore and these are my readings at idel-status:

cpuz149.jpg

The problem is, that I'm not quite sure how my settings in BIOS are. These is a example-photo of a AbitIX38QGT BIOS:

ABIT-IX38-QuadGT-BIOS-014.jpg

I think I can adjust Vcore with the VID setting (even if the description is unspecific, because VID is something else). Is that correct? In my case the value is 1.25V.
And what is meant with offset-setting ( in my case 0.0V) ? Is it possible, that I control the Vcore with that setting (VID+offset equals target voltage below)? When I change the VID setting above (yes its true - thats possible, look at the picture) EIST is automatically deactivated an I dont want that.

So now I need to know my current Voltage. When I overclock the cpu to 3.6 Ghz by just setting the FSB to 400 and run prime everythings is fine (I'm testing for 10 hrs now). But cpu-z shows me a Vcore of 0.976V! Is that possible. And its stable?!

0976e.jpg
Edited by meschaeken - 7/25/11 at 4:07am
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post #2 of 8
Hallo! Welcome to overclock.net.
The voltage you apply in the BIOS isn`t the voltage you see in CPU-Z.
The voltage drops - that is normal.
There is also this difference you see in your last picture. The idle voltage drops when you put your CPU under load. That is normal too.
Besides with a voltage of under 1V is nearly impossible to get your stuff stable.
The default voltage is ~1,24v. So you will need more to get to 3,6GHz.
For my Q9550 i needed 1,28V (idle) This is just to give you an idea about the amount.
And please don`t go much higher than ~1,36-1,37V.
I hope this helps you a bit.
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post #3 of 8
Thread Starter 
Hey! Thank you and thanks for the response.
Believe it or not, but these are my readings at 3.6Ghz. Then cpu-z doesn't display the correct things to me. Look at the screenshot. All I can say is, that it runs stable and thats what cpu-z shows. But I don't believe its Vcore, too. It shows exactly the same value in idle and under load.
Thats what speedfan displays. The red line is called "CPU Core" and it increases with load. The grey line is VTT and the green one (difficult to see, just a bit above the grey) ist the Vcore.
speedfanyw.jpg
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CPUMotherboardGraphicsRAM
Q9650 Abit IX38-QuadGT Asus GTX 570 DCII 8GB DDR800 
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Corsair AX850 (seasonic) 
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CPUMotherboardGraphicsRAM
Q9650 Abit IX38-QuadGT Asus GTX 570 DCII 8GB DDR800 
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Corsair AX850 (seasonic) 
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post #4 of 8
Hello. Please take a moment to follow this link and fill out your computer specs so that people will be better able to help you.

Also, as stated previously: voltage fluctuation is normal. There are steps you can take to minimize it, but, it's just a fact and nothing to be overly worried about.

Fill out your system specs so that we can see what kind of cooling you have on your cpu--that would help figure out how far you should go with your overclock.

Welcome to OCN and enjoy the forums...
 
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post #5 of 8
Thread Starter 
Cooling shouldn't be a problem but i filled out the specs.
The thing is that I just don't know where to give more voltage without deactivating EIST. With offset?
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CPUMotherboardGraphicsRAM
Q9650 Abit IX38-QuadGT Asus GTX 570 DCII 8GB DDR800 
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Corsair AX850 (seasonic) 
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My System
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CPUMotherboardGraphicsRAM
Q9650 Abit IX38-QuadGT Asus GTX 570 DCII 8GB DDR800 
Power
Corsair AX850 (seasonic) 
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post #6 of 8
If i understand your BIOS right the voltage you need to raise is the
"CPU Core Voltage VID"
First entry in your BIOS screenshot.
But this value is @1,3375V and your CPU-Z screenshot shows only 1,25V.
If you apply 1,3375V in the BIOS and only get 1,25V IDLE this would be wicked.
Besides 1,3375 should be enough to get your 3,6GHz. Maybe the Voltage reading from CPU-Z is buggy or the on_board voltmeter sucks.
Anyway you shouldn`t need much more...
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CPUMotherboardGraphicsRAM
I7 3930K Asus Sabertooth Asus GTX 680 8x4GB G.Skill@1337MHz 
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/* Redemption*/
(14 items)
 
  
CPUMotherboardGraphicsRAM
I7 3930K Asus Sabertooth Asus GTX 680 8x4GB G.Skill@1337MHz 
Hard DriveOptical DriveCoolingOS
2xM4 64GB/ / F3 - 1TB / 2x2TB Baracudas some LG Modified EK 360 HFX 2x(Win7 x64) 
MonitorKeyboardPowerCase
SyncMaster P2770HD and SyncMaster 940NW Roccat Isku Corsair Gold AX750 NZXT 810 Switch 
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Rocat Kone[+] Razer exactmat X 
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post #7 of 8
Thread Starter 
Now you got something wrong, sorry.
First the BIOS screenshot is not mine. I noted that under the picture. I got it from the internet, from a review, just to show how the BIOS looks like. My Value is 1.25V.
And the 3.6Ghz are not a problem, too. I got them at stock. No more voltage needed. I have them right now. I want to reach a bit more, perhaps 4, if thats possible.
And CPU Core Voltage VID automatically deactivates EIST if its changed. So I wonder what the offset is. There are only positive Values possible and the value is added to VID and equals Target Voltage then. Perhaps thats the setting to change?
BTW
I looked up the voltage in BIOS (monitoring) and there I have 1.23V.
Edited by meschaeken - 7/26/11 at 3:33am
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q9650 Abit IX38-QuadGT Asus GTX 570 DCII 8GB DDR800 
Power
Corsair AX850 (seasonic) 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q9650 Abit IX38-QuadGT Asus GTX 570 DCII 8GB DDR800 
Power
Corsair AX850 (seasonic) 
  hide details  
Reply
post #8 of 8
Thread Starter 
Please don't forget me smile.gif ...so many people here that I'm almost on page 3 within two days...wow wink.gif
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q9650 Abit IX38-QuadGT Asus GTX 570 DCII 8GB DDR800 
Power
Corsair AX850 (seasonic) 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q9650 Abit IX38-QuadGT Asus GTX 570 DCII 8GB DDR800 
Power
Corsair AX850 (seasonic) 
  hide details  
Reply
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