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Why can't I overclock my GTX480 over 820 mhz?

post #1 of 14
Thread Starter 
I used 1.100 voltage for 830 mhz. But 815 works fine with 1.050. If I go over 820 mhz games will simply crash or I get a driver stopped responding and was recovered or I get a complete system freeze.
Please help
    
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post #2 of 14
There's nothing to say that your card will operate at 830mhz with 1.1v, some chips may need more while some may need less.
un-overkill
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post #3 of 14
Thread Starter 
But it's just 15 mhz difference. 15 more mhz can't need 0.5 more vcore??!!
    
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post #4 of 14
Apparenty not.
un-overkill
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post #5 of 14
Looks like your manufacturer put some disappointment in the box as well as a video card... on a more serious note; you may need to go more with your volts to get the speed up, some cards may need a considerable step to bring out more of the card, with that, temps could also play a major factor in this.
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post #6 of 14
You've simply hit the limits.
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post #7 of 14
As the users above me stated, some chips are just better than others. The difference can range from huge to minor. Seems like your chip either maxed out or wants some more voltage.
Thor is here!!!
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post #8 of 14
all chips have there limit
I was able to push my 480's up by 100mhz without changing anything
its just luck of the draw and your settings
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post #9 of 14
Thread Starter 
Maybe my psu has reached it's limits? It's only a 550 wats corsair psu.
Can a bad overclock cause a total system freeze(have to restart from the button) ?
    
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post #10 of 14
I think cooling also plays a role in it too. I tested mine before when it was really cold outside and managed to lower the voltage by .025v and overclock it to 785mhz 100% stable.

When in the cold environment it worked great and didn't go over 54c load. As soon as I reassembled it back inside, I couldn't even run at stock speeds with the lower voltage, let alone the overclock.
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