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Radeon HD 7990 - Overheating?, Low VDDC? or is this normal?.

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  • GPUs
  • Computers
  • HD
  • Graphics
Last response: in Graphics & Displays
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December 8, 2013 11:44:57 AM

Hey people.

I built a computer recently,

CPU = FX-8350 (Noctua NH-D14
MOBO = M5A99FX PRO R2.0
GPU = XFX HD 7990
PSU = XFX 750W Pro Black edition.
MEM = Corsair Vengeance DDR3 1600mhz 4GB x 2
HDD = WD Caviar Black 1 TB

My Case is a Cooler Master Storm Stryker if it helps at all.

I don't yet have an SSD or any water-cooling, but i am defiantly looking into purchasing them.

I have not yet overclocked anything, because i think i will need water cooling, and i have no understanding of overclocking but wish to learn.

My problem:
All seems okay with my computer, except the graphics card, as i believe is a "crossfire-in-one" GPU.

Although, I'm confused as to why one GPU is idling at around 58-60c, and the other is idleing at around 38c.

i'm guessing that they wont be exactly the same temps, but shouldn't they be a little less than 20 degrees in difference? more like 4-6 degrees?

Under full load (MSI Kombustor) GPU temps are more agreeable, with GPU1 at 78-80c and GPU2 at 72-73c

Also in GPU-Z it shows:
GPU1 VDDC to be 0.95@idle and 1.20@full load.
GPU2 VDDC to be at 0.85 @idle 1.165@full load,

Is this also normal? and what should i do to fix this if not?.

More about : radeon 7990 overheating low vddc normal

December 8, 2013 1:18:00 PM

Try blowing on the hotter GPU... Both GPU's aren't used equally at the same time so they won't be even
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December 8, 2013 1:36:43 PM

Lumber-jack said:
Try blowing on the hotter GPU... Both GPU's aren't used equally at the same time so they won't be even


Okay Mr Smart Arse... fwwwwwwwwwwwwwwtt... OH IT WORKED!.

Not.

You did not help what so ever...
both GPUs are at 0% usage, when i mention IDLE.. maybe GPU1 get like 2-3% when i move the mouse or something, but i'm sure that is not causing a 20 degree increase in temp...

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December 8, 2013 10:47:22 PM

If you read the second part of my post both GPU's aren't used equally unless they are maxed out. Run some tests and you will see the load is not equal for GPU0 and GPU1 therefore the temp won't be either... IMO If they spread it across the GPU's equally it would cause more problems as not only would they have to adjust to load requirements but also adjust the load between each and constantly have to fight each other readjusting. While it may say 0% it obviously isn't since there is a picture being displayed. Run the tests and watch the load increase and you will see it rise unequally - the temp should generally correspond with load.

Mine has 20C difference at idle if it makes you feel any better. I suggest you run some tests and record readings at load and idle for future benchmark comparison if you suspect problems. I am confident that your 7990 had been this way all along.

One other thing that could increase GPU temps is cooling/airflow around the video card. Make sure that both GPU's have adequate ventilation equally since it is a huge card. I had mine mounted in the bottom slot and it was too close to the PSU and temps were 20C higher until I could mount it higher with more clearance.
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December 9, 2013 1:39:20 PM

Okay thanks for a much better answer,

I have loaded my 7990 with Kombustor, and with ULPS on, GPU1 is at 99% all the time even while idle and not running Kombustor.
And GPU2 only goes to 99% when running Kombustor. Both GPUs are around 74-75c, which is okay except for GPU1 being maxed when idle.

Without ULPS, both are at 0% when not running Kombuster, and both end up at 97-99% when running it.
but the temps are GPU1 80c GPU2 58c or something.

I just don't understand why this is, but ill take your word on the temps, both GPUs never get up to 90c.
although i have seen one GPU to reach 85c.

i guess i'm just worried this pricey card is faulty :p 
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