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MSI 890FX board CPU core voltage SPIKE under LOAD ????

post #1 of 29
Thread Starter 
Hello every one,

I seem to be having a little problem with my new setup. When OC’ing my CPU, I’ve set the cpu core voltage to 1.5 V in the BIOS. I boot up into windows, no problem. I run Prime95, system is stable, however I noticed in CPU-Z and HWmonitor that my CPU core voltage is up to and 1.63.
If I stop prime, the voltage goes back down to 1.5v ?????

I disabled every single type of power save option in the BIOS, I even updated the BIOS from version 18.0 to 18.2 (AM3+ support) and it made no difference. If I set the BIOS settings back to default, NO OC and run Prime the CPU voltage spikes up in the same manner.

I’ve found some other people online with the same issue, same board, different PSU, different AMD chips, but no fix ??

Has any one been able to fix this or is any one else having the same issue?
Edited by thestef - 4/26/11 at 6:23am
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post #2 of 29
This is not an issue and does not need a fix.
It's called Vboost and is the way it is supposed to be.

Why don't you like it??
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post #3 of 29
Thread Starter 
We'll if my CPU voltage goes up from 1.5v to 1.63v when under load, isn’t that to high?

Should I maybe set the BIOS core voltage to MAX (1.42v).

The logic being 1.63 v minus 1.5v = 0.13v

1.42v + 0.13v = 1.55v.

I read every where on this forum that 1.55v is the max this CPU should be subjected to, and that 55C is the max temp.
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post #4 of 29
Quote:
Originally Posted by ronnin426850 View Post
Why don't you like it??
Somehow I don't think he wants 1.63v on either air or water
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post #5 of 29
Thread Starter 
Quote:
Originally Posted by Problame View Post
Somehow I don't think he wants 1.63v on either air or water
We'll I just hope I didn't screw up the chip, I've been running a lot of Prime95 tests before I even realized it was this high. But I've only been running 15 - 20 minute sessions of Prime95.

Any recommendations concerning my above calculations?
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post #6 of 29
Quote:
Originally Posted by thestef View Post
We'll I just hope I didn't screw up the chip, I've been running a lot of Prime95 tests before I even realized it was this high. But I've only been running 15 - 20 minute sessions of Prime95.

Any recommendations concerning my above calculations?
You have C1E and CnQ disabled so all I can think of is (some kind of) LLC thats still enabled.
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post #7 of 29
If you dont have LLC option(enable, disable) in your BIOS, is enabled by the manufacturer.
Set your BIOS voltage lower. Most of 1090 dont need 1.50V(at full load) for 4GHz
Edited by IOSEFINI - 4/26/11 at 7:11am
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post #8 of 29
Thread Starter 
Quote:
Originally Posted by IOSEFINI View Post
If you dont have LLC option(enable, disable) in your BIOS, is enabled by the manufacturer.
Set your BIOS voltage lower
Yeah the BIOS doesn't have any option to disable LLC or Vboost... I checked every single option in there. Like I wrote above, I found more then 1 issue liek this online (google search) with no resolution. I just figured I would ask in case other users on this forum have the same board.

I'll have to set it lower for now, I just hope I can still get a reasonnable OC this way.
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post #9 of 29
Quote:
Originally Posted by thestef View Post
Yeah the BIOS doesn't have any option to disable LLC or Vboost... I checked every single option in there. Like I wrote above, I found more then 1 issue liek this online (google search) with no resolution. I just figured I would ask in case other users on this forum have the same board.

I'll have to set it lower for now, I just hope I can still get a reasonnable OC this way.
I've just checked your boards manual and indeed doesn't state LLC or Vboost anywhere. I see you turned the voltage down already, maybe you can contact MSI for another (beta) BIOS?
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post #10 of 29
1.42 vcore is enough at 4GHz. Are you using a performance cpu cooler?
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