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GTX 470 Voltage Tweaking

post #1 of 22
Thread Starter 
hello all.
i got my gtx 470 in my water cooling setup and everything seemed perfect as my load temps with 0.975 volts and stock clocks were about at 40C, and thought i could squeeze a lot more juice from overclocking it.
while i managed to reach 860/1720/1950 and 1.087 volts i run kombustor, furmark and a lot of hours on cod:bo to check it.
everything seemed to be stable but while i was watching a two and a half men episode and screen froze and i rebooted, i got no signal at start, tried to leave it without any power for a min or 2 and when i booted i thought i could reinstall the drivers to see if there was a prob there, while i did, i noticed the stability and the freezing being stopped.
i played some cod:bo and kombustor was all stable, but as i tried to reach my previous stable clocks, it freezes and i have to reboot. i read somewhere that 1087v is a 24/7 safe voltage but i think otherwise now.
any opinions why this happened and any explanation? i really want to overclock it again as there is so much gain and the heat or sound aint a prob

thanks a lot guys
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Th3 BeAsT
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post #2 of 22
What brand 470 do you have as some OC better than others. ASUS cards are great for overclocking with the VoltageTweak tool, for example. You may also avoid editing your memory clock speeds too much with voltage increase to the GPU as this can cause some issues when OCing with a Fermi.
post #3 of 22
It sounds like you simply don't have enough voltage for 860 core. (i can only get ~800 stable at 1.087V) How far could you get on your second attempt?

Here is a thread that contains a modded bios that allows voltages up to 1.21V

And i suggest you use OCCT to test for stability, go to GPU test and check the error checking box. The default test length is one hour but really, it's intense enough that 10 mins error free will usually mean a stable overclock.

I would say 1.087V is perfectly safe for 24/7 use and would not have any worries about 1.1V for 24/7 under water. (these numbers are based on my opinion).

EDIT: Also, I would overclock the core first, find a stable overclock, and then start on the memory. If you do both at once you have 2 variables to worry about.
Edited by SyncMaster753 - 12/23/10 at 8:48am
    
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post #4 of 22
What sync said. Being stable in Kombustor and one game means diddly-squat. Try OCCT.

And 1950 is actually pretty high for the memory on a 470, even under h2o. Try something lower. And 860 on 1.087V also might not quite be stable. I'd not worry about running like 1.100V under water myself, but like sync said, you have to use a modded bios (can be your own, edited w/nibitor) to get over 1.087.
    
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post #5 of 22
Thread Starter 
atm i have a gigabyte gtx 470. well i know that it sound pretty high but again eventhough i used 1075 volts i have managed through game and kombustor to see thats its stable at 860/1950, dont know why ;p
lemme try 10 mins of occt as was suggested and will get back to you
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Th3 BeAsT
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post #6 of 22
Thread Starter 
so guys thanks a lot i checked with 1087v with occt 10 mins at 800/1900 and was finished without errors, will stay with that for the time being and will try to go a bit further
Th3 BeAsT
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Th3 BeAsT
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post #7 of 22
1.087 is fine for 24/7... those initial speeds tho would require a very good overclocking gpu. Most seem to end up more in the 750-800 range on core and ~1800-1850 on memory
    
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post #8 of 22
Thread Starter 
well then i am pretty satisfied with 800/1900 with 1087v will make a 1hour test as i will be heading out tonight and i am hoping it will remain stable
Th3 BeAsT
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Th3 BeAsT
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post #9 of 22
Had a very similar problem. Solution = Upped the voltage to 1112mV to stabilise a 842/1692/1700 overclock. Folding right now at 67C

Had to mod the bios to up max voltage from 1087mV.
post #10 of 22
Thread Starter 
i dont really wanna mod the bios for just a voltage tweak for a gpu, i will get as much as i can from the 1087mv
will try now 810/1900 and see how it goes
thanks all those who replied here
Th3 BeAsT
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Th3 BeAsT
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