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11.8V under load with new card

post #1 of 17
Thread Starter 
I installed a new HD6850, this is with a sandybridge and an old Fortron powersupply.

I ran 3dMark06 and the +12V minimum reported was 11.8V. I think this is safe but I wish a had a way to load the cpu and gpu to 100% and watch the +12V reading.

The only thing I am concerned about is that this PS has 2x12V rails and I want to make sure the video card 6pin is a different rail than the CPU.

I know I am pushing things but so far I haven't had any crashing and the power supply used to power a Q9550 +HD4770 which would dip to 11.7V and I never had an issue in 3 years.
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post #2 of 17
Are you using a multimeter or software, software can be very inaccurate.
post #3 of 17
As long as it does not drop under 11.8v tho I think that is still within ATX 2.22 spec. But if its more then yeah it prob bogging, and I dont trust software when its reading PSU voltages it lies alot lol.
 
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post #4 of 17
post #5 of 17
Thread Starter 
Well I have a fluke DMM, but again with 2 rails I don't really know which one I am measuring. Guess some experimentation is in order.

Is 3DMark06 sufficient for loading the GPU?

Or do you think I am OCD, I mean 11.8V according to my motherboard's software (Sandybridge) should put me in the clear, no ?
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post #6 of 17
Iv'e had systems run for ever reading 11.7v,sucks looking at it all the time wondering,but nothing ever came of it.
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post #7 of 17
GPU-Z and my bios reports my 12v voltage as 11.8v, but measuring with a multimeter actually showed 12.15v.

Point being, ignore bios and (especially) software voltages and buy a multimeter.
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post #8 of 17
if you plan on overclocking it might make you have to put higher vcore through the cpu just so it can be stable possably but Im not sure how much a 0.2v drop in the 12v rail will cause when the vrms get ahold of the power.

as long as it loads the gpu up it really doesnt matter, but the harder it pushes your gpu the better i would say, plus it will load the cpu also which would be a plus.
 
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post #9 of 17
Thread Starter 
No plans to overclock the cpu.

I will try the multimeter, just not sure how to tell which 12+ volt rail I am measuring.
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post #10 of 17
well if you can manage to get a prong into the plug for the cpu without damaging it, that is definitely 1 rail, the other is gonna be attached to the 6 or 8 pin gpu power cables more likely.
 
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