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Just Wondering...What's the Safest 24/7 Voltage for Unlocked 6950? - Page 2

post #11 of 16
Quote:
Originally Posted by u3b3rg33k;15610971 
I'd have to join in the "depends on the temps" bandwagon.



My 6950 is running @ 900MHz @ 1.175v folding 24/7.
It was running just fine unlocked @840 @ 1.10v. I just wanted that little extra bit, so "pushing" the voltage to 6970 stock isn't asking too much.

My vote is always as little voltage as you can use while stable (isn't that what everyone ties for?).

Do you actually need that voltage? The few cards ive seen have all done 900 without needing extra voltage. And when going further just 15-20mv gives a nice increase. You might be able to get away with much lower than 1175.
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post #12 of 16
Quote:
Originally Posted by drBlahMan;15613841 
I see the both of you have increased GPU clock speed...what about your memory? Is your memory OC'ed beyond 1375MHz?
I have not pushed memory beyond there, no.

Quote:
Originally Posted by mike87;15606244 
stock voltages:
6950 = 1.06-1.1V (some cards run a little lower)
6970 = 1.175V
6950 and 6970 use the same silicon - The choice to run 1.06-1.1v is most likely to hold TDP down, which is fine. Mine is stock @ 1.1, but it's a factory turbo card, so it probably needs it. I couldn't get it to run stable 20MHz faster than it's stock speed (840MHz) without bumping the voltage, while it ran just fine unlocked at 840MHz.
Quote:
Originally Posted by whippy;15613915 
Do you actually need that voltage? The few cards ive seen have all done 900 without needing extra voltage. And when going further just 15-20mv gives a nice increase. You might be able to get away with much lower than 1175.

I picked 1.175 since as far as I know, I have to set voltage in the bios. Since 1.175V is the default for an uncrippled cayman, I figured it'd be a safe bet for 100% stability while folding 24/7. I may not need it all, but my temps haven't really changed any; still holding @ 55-56C while folding @ 55% fan speed.
 
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post #13 of 16
well, it varies from card to card and depends also on the type of games you test the stability.

My card, for e.g., was able to run at 880/1375 on 1100 mv, and was kombustor and OCCT stable for 1 hour. However, the minute I loaded Crysis 2 and The Witcher 2, i used to get a crash to the desktop with a "AMD Display driver stopped working and has recovered" message. So I upped the volts to 1125 and it became Crysis 2 and Witcher 2 stable. my temps remain around 67 degrees under load so I am quite happy.

but even the 0025 mv increase causes nearly 10 degrees difference in temps under load, from stock 6950 clocks to 6970 clocks. that's something to keep in mind. I would say that upto 1200 is ok for the adventurous but beyond that is for people who wouldn't mind frying their cards smile.gif
    
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post #14 of 16
Thread Starter 
Well, I had finally got my gpu to be stable @ 880/1536/1460 (it's a sweet OC combo) biggrin.gif I've tested with a higher gpu core in the +900MHz but it had turn out to be a few fps slower than having a 800MHz/1460MHz. My voltage is set @ 1.19v right now. Going to test to see if I can get the voltage lower today smile.gif

EDIT: So actually in my opinion, the sweet spot is basically running an unlocked reference 6950 2GB @ the 6970 stock speed. I experience no real-time gameplay performance increase when OC'ed higher. So I have found myself content with a stable 880/1536/1375 @ 1.15v thumb.gif
Edited by drBlahMan - 11/9/11 at 5:54am
post #15 of 16
Quote:
Originally Posted by gsa700 View Post


I don't agree. ;-)

My unlocked 6950's both run 950 Mhz with stock 6970 volts.

1.175

You don't always need more voltage....

This is correct. My card(Toxic) has a stock voltage of 1.175v. For my oc I have it at 1.250v. works like a charm.
You may not always need more voltage, but on some cards you will for stability. Kinda sucks but with decent case cooling you should be fine.
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post #16 of 16
See what clocks you get with 1.2, 1.25 and 1.3 volts. You'll see diminishing returns around 1.22-1.24.

The typical general rule of thumb is that its okay .1 volts higher than stock.
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