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Voltage with 1090T and GA-990FXA-UD3 - all over the place?

post #1 of 9
Thread Starter 
OK, I give up - I need help.

I'm trying to overclock my 1090T to 4.0GHz using the multiplier (200 x 20). I can get it to boot, and Prime95 runs okay for enough time that I think I am good, but I have one concern. My voltages are just all over the place, and I have no clue what to do to keep them under control.

Admittedly, I don't know terribly much about voltages, besides that I need to make sure mine are set in such a way that things are stable and not too hot. I achieved that with a Vcore of 1.400 in my BIOS. CPU-Z gives me that number while things are idle, but when I run Prime95, it immediately launches up to the 1.44-1.45 range. I've tried everything in the BIOS to get it to just stay where I want it, but nothing is working. This is only a real concern because at those voltages, my core temp is getting close to 59-60 C, and 62 is the highest I can get.

My questions, then. First, can someone link me somewhere that explains to a dummy like me how voltages work and why mine are fluctuating? And second, anyone have any suggestions with this motherboard/processor as to what I can do to try to keep things cool and voltages where I want them?

I'm sure I need to provide more info, so let me know and I can do so. Thanks to anyone who can help.
post #2 of 9
What is your Load Line Calibration set to?
post #3 of 9
Quote:
Originally Posted by VitalShot View Post

What is your Load Line Calibration set to?

this is my concern as well.
each mobo is different, youll have to play around with it.

basicly depending on the setting it will eigther drop or ramp your voltage under load from what you set it to in bios. try to find a setting that increses it by just a smidgen (.o2-.03v) and set your bios vcore to compensate acordingly.

i found this out the hard way smile.gif


also make sure turbo and CnQ are off.
post #4 of 9
Quote:
Originally Posted by AlaskaFox View Post

this is my concern as well.
each mobo is different, youll have to play around with it.

basicly depending on the setting it will eigther drop or ramp your voltage under load from what you set it to in bios. try to find a setting that increses it by just a smidgen (.o2-.03v) and set your bios vcore to compensate acordingly.

i found this out the hard way smile.gif


also make sure turbo and CnQ are off.

This too, I forgot to mention Turbo and CnQ. Most motherboards allow LLC to be set to auto, but this is not always the case.
post #5 of 9
In my experience I've found LLC on higher settings does nothing but increase the overall vcore and vcore fluctuation, which is not what you want. You want the highest possible overclock with the lowest possible voltage. Have LLC turned off or on the lowest setting if your motherboard allows.

That's how I've gotten to work best in my experience. Mostly on ASRock boards recently.

Also once your overclock is stable you can re-enable CnQ for those lovely power savings smile.gif
post #6 of 9
Quote:
Originally Posted by linkin93 View Post

In my experience I've found LLC on higher settings does nothing but increase the overall vcore and vcore fluctuation, which is not what you want. You want the highest possible overclock with the lowest possible voltage. Have LLC turned off or on the lowest setting if your motherboard allows.

That's how I've gotten to work best in my experience. Mostly on ASRock boards recently.

Yeah, if auto isn't working for your motherboard then you should definitely set LLC to the lowest possible value and see if this fixes your voltage issue.
post #7 of 9
Quote:
Originally Posted by VitalShot View Post

Yeah, if auto isn't working for your motherboard then you should definitely set LLC to the lowest possible value and see if this fixes your voltage issue.

that depends, mine is best on 75% (ultra high)
Under load with that setting i get an increase of .02v

with it on 100% +.05
50% or lower i can droop by like a whole .1


it really depends on the board and youll have to test out the LLC to find the perfect setting for you
post #8 of 9
Quote:
Originally Posted by linkin93 View Post

In my experience I've found LLC on higher settings does nothing but increase the overall vcore and vcore fluctuation, which is not what you want. You want the highest possible overclock with the lowest possible voltage. Have LLC turned off or on the lowest setting if your motherboard allows.

That's how I've gotten to work best in my experience. Mostly on ASRock boards recently.

Also once your overclock is stable you can re-enable CnQ for those lovely power savings smile.gif

the job of llc is to reduce the overall vcore fluctuation, although it differs from board to board.
my htpc's llc setting is set to the maximum level to force a constant voltage, where my desktop is set to 'ultra high' which boost the voltage 0.05-0.06v underload.
it's different for each processor.

if you find your voltage is too much op set your llc to extreme or ultra high, and cpu voltage to default.
what you are looking for is a cpu voltage and llc setting that doesn't go over your thermal limit.
for my bulldozer that was 1.392v and llc at 'ultra high'; my 955be was 1.4v and extreme.

check out the 990fxa owners club to see what others may be getting.
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post #9 of 9
Thread Starter 
Thanks everyone, that's what I was leaning towards and it's nice to see I wasn't making it up.

When LLC was set to Auto, I was seeing my voltage go up by as much as 0.1v under load, idle it's sitting around the 1.4 I want. That's what's confusing me - I'm not ever going below 1.400, but it has no issue spiking it as high as it wants. Obviously I'd prefer it not do that, so I'll tweak the LLC settings and see if one of them puts me where I want to be. If not, maybe I'll set the voltage lower and let it compensate? It's a never-ending game.. smile.gif

EDIT: That did it, apparently LLC is just going to drive up my voltage no matter what I set it at. A simple adjustment to 1.375 and we appear to be golden (and slightly cooler!) Thanks again everyone.
Edited by ajohns41 - 1/20/13 at 2:03pm
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