HELP - PC Restarting With GTX 780 Ti / PSU?

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Adol Christin

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Sep 17, 2014
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CPU - i7 2600k (Stock)
16GB 1333mhz
Gigabyte Z77 D3H Motherboard
Gigabyte Superb 720w

I recently got a Gigabyte 780 Ti ghz card. Whenever I play high end games like Crysis 3 or Dead Rising 3. My PC just restarts itself. But when I play slightly less demanding games like SimCity, Street Fighter 4 or Borderlands 2, it runs fine. SO I think it most probably a PSU issue. I had a gtx 670 before, and that ran fine.

My PSU is old. Its a Gigabyte Superb 720W. So I'm wondering, is this enough to run my 780 Ti Ghz? I've heard this PSU isn't good for high end cards. Any help is greatly appreciated thanks a lot.
 
Solution
photonboy
I doubt it's the Power Supply. Most likely it's the graphics card.

The power supply can provide up to about 375Watts to the graphics card as it has 2x8-pin available (150W per) plus the 75W from the motherboard.

*IMO you have two options:
1) Downclock the graphics card until it becomes stable (start with 100MHz below current max), or

2) Contact Gigabyte and inform them of this. Since they also make the power supply you should mention that in case they've had any issues but you're well within the specs it should provide.

Other:
It's also possible you have insufficient cooling for the card, though I suspect it's more of a POWER issue with the GPU becoming unstable.
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photonboy

photonboy

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Jun 20, 2006
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I doubt it's the Power Supply. Most likely it's the graphics card.

The power supply can provide up to about 375Watts to the graphics card as it has 2x8-pin available (150W per) plus the 75W from the motherboard.

*IMO you have two options:
1) Downclock the graphics card until it becomes stable (start with 100MHz below current max), or

2) Contact Gigabyte and inform them of this. Since they also make the power supply you should mention that in case they've had any issues but you're well within the specs it should provide.

Other:
It's also possible you have insufficient cooling for the card, though I suspect it's more of a POWER issue with the GPU becoming unstable.
 
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Solution
photonboy

photonboy

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Jun 20, 2006
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Update:
http://hothardware.com/Reviews/NVIDIA-GeForce-GTX-780-Ti-Roundup-EVGA-Gigabyte-And-MSI-Duke-It-Out/?page=11

"With regards to stability, we have to knock Gigabyte for kicking us to the desktop on occasion. It didn't happen all the time, but enough to make us feel as though this particular card is clocked a tad too high."

My advice is drop the frequency a bit until it runs stable. It appears to be the CARD not the power supply. I see no point in a replacement since this appears to be a common issue.

If 100Mhz off the top is stable, then try only a 50MHz drop. If that's stable quit.
 
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Adol Christin

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Sep 17, 2014
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I did actually try that with MSI Afterburner and OC guru 2. It only lets me downclock to maximum of -105 for Core GPU and -550 for the Memory. Is there anyway to downclock it MORE??
 
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quarrel

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May 14, 2014
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It could be a few things. Yes, it could be your psw. it Seems that it is enough to run your system, but as you say it is old and might actually not be pumping out the amount of w it used it. (could also be full of dust and dirt causing the psw to overheat and reset)

the other issue it COULD be is overhearing, power supply or gpu. Either one. Or maybe your mobo is can't handle the heat. If your friend has a power supply that you could borrow it would be the easiest way to see if that is the cause. Give the whole system a super clean as well, you never know.
 
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Adol Christin

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The funny thing is, if I connect my Gigabyte GTX 670OC, it runs fine. NO restarts at all.
 
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photonboy

photonboy

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Jun 20, 2006
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That's in keeping with my explanation that it's the graphics card which is unstable which has been confirmed by the link I provided. Since the graphics card is the problem, swapping in a different card solves your problem.

As for your DOWNCLOCK option, 100MHz for the GPU is fairly significant and about what I recommended to start anyway. So:
1) Downclock the GPU only to start. If stable stay there for now. If not...

2) Downlock the VRAM as well. If you are NOW stable...

3) Tweak the values if you wish or stick where you are.

*As I said, the Gigabyte card is apparently clocked a bit too high for its hardware and cooling solution thus I'm not sure if there's much point in getting a replacement. I suppose you could aim for a reimbursement since it seems to be a design flaw. If so, that would be awesome and you could put the money towards a GTX980 ($549 USD for reference cooler) which is faster than a GTX780Ti.
 
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Adol Christin

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Sep 17, 2014
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I think I'm gonna go with the 980. Even if downclock the gpu clock. When the game runs, it ignores it and runs at full clock speed. Do I have to mess with the voltage also?

 
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