Gigabyte windforce 7950: even slightest OC causes instability

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Kosmonaut

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Jun 21, 2013
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Hello, it appears that even the slightest overclock on my 7950 will cause instability. Recently I tried upping the core clock to between 1000 - 1100, this caused the graphics to crash completely, even at 1000. I then tried 990, but this would cause my direct3d driver to crash after a while when playing bioshock infinite ("the Direct3D 11 device has been removed or has crashed"). Just now I was playing far cry 3 (which I have ALL KINDS of performance issue with, any hints would be greatly appreciated) and decided to give the core clock just a slight boost to 950 (was actually 951 due to dodgy slider), worked for a while before producing artifacts.

My temperatures are normal, not even reaching 60, so what is going on? Why can't I overclock this card at all? It seems others can push this card to 1000 or 1100 easily.
 
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lostgamer_03

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Aug 4, 2012
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Increasing power target/voltages will make it possible for your GPU to draw more power, when you go 'big' on the overclocking the GPU needs more power. If it can't get enough power, it will not work properly.

Be easy on tweaking with the voltages though, it is where the danger lies within overclocking.

Therefore I would suggest you to try and increase the voltages by a bit and see if it helps (it should). :)
 
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Kosmonaut

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Jun 21, 2013
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This is annoying as I was told I would not need to adjust that stuff with this specific card, I did however once up the "power control settings" by 20% in ccc as suggested, this caused my computer to crash immediately. Also I don't intend to go "big" on the overclocking, a 50 - 100 increase in the core clock cannot be considered big, can it?
 
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lostgamer_03

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Aug 4, 2012
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It is not only big, mate. It is extreme, beyond the limits. 50-100%, even the best enthusiast would have trouble getting such good frequencies and I would bet even if they got there, then it would not be stable.

I usually overclock 15-20% on both memory clock and core clock depending on the GPU I use.

http://www.hardwarecanucks.com/forum/hardware-canucks-reviews/53456-gigabyte-hd-7950-windforce-msi-hd-7950-twin-frozr-iii-review-19.html

http://www.pureoverclock.com/Review-detail/gigabyte-7950-windforce/17/

Have a look at the at these reviews of the Gigabyte Windforce 7950, your overclocks are very high compared to the reviews and the GPU can't really deal with such high frequencies unless you really know your sh*t.

However I've seen core clock of 1224 MHz on the GPU you got, but with the highest voltage. It is playing with the fire and I would not recommend it. It will either shorten the life span of your GPU or kill it.
 
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Kosmonaut

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Jun 21, 2013
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Max stable overclock I'm able to get so far is 975mhz core clock @ +15% on the power control setting in ccc, as soon as I go to 1000mhz and up the power more it becomes unstable. Everyone else with this card seems perfectly capable of getting more than 1000mhz as far as I can tell, there must still be something amiss here.

edit: scrap that, tested again on far cry 3 and massive instability still which is gone when I reduce back to 900, this card simply will not overclock.
 
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Kosmonaut

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Jun 21, 2013
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I do not know, all I know is that it is the gigabyte windforce with 3 fans for extra cooling, and that its default core clock is 900mhz. The windforce is supposed to be good for overclocking. My motherboard is PCIe 2.0 x16 rather than PCIe 3.0, might that explain my inability to overclock this?

edit: this is my card http://www.gigabyte.com/products/product-page.aspx?pid=4121#ov
 
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