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Hd 7970 Oc Help

post #1 of 5
Thread Starter 
hello im trying to oc My sapphire dual x Hd 7970. I m using the 2nd bios which comes oc at 1000 Mhz with 1450 Memory clock@ 1050 mv voltage, i am trying to hit 1100 but cant do so my card keeps crashing unless i check "constant voltage option" and over volt to ateast 1250-13 mv. Is there anything i could do to OC without constant voltage as i think it will damage the card in long run

extra info : i have used TRIXX, catalyst center and MSI afterburner with the same result and checked my voltage with gpu-z ....it only works at 11000 when Constant voltage is checked, is it normal?
post #2 of 5
Have you cranked up the power limit ?
In my limited test, at 1100mhz core, I was getting 37 ish fps in extreme HD unigine valley at 0% power limit
at the same core speed, I was more stable and was getting more fps with the powerlimit
basicly the power limit increase the max power the card can draw from the powersuply
edit: i got 43-44 fps with power limit at 14%
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post #3 of 5
Thread Starter 
Quote:
Originally Posted by adgame View Post

Have you cranked up the power limit ?
In my limited test, at 1100mhz core, I was getting 37 ish fps in extreme HD unigine valley at 0% power limit
at the same core speed, I was more stable and was getting more fps with the powerlimit
basicly the power limit increase the max power the card can draw from the powersuply
edit: i got 43-44 fps with power limit at 14%

Yes i've tried cranking it up all the way to 20%....but this thing just wont oc without constant vol
post #4 of 5
Thread Starter 
I play bf3 on ultra @ 1920 x 1080 with 2x msaa and the frames still drop to 51-52 somtimes .....even 30s when a tank explodes or something....Some1 advised me to oc my i7 950 to 4ghz, which i did, but no significant improvements....im tryna oc to get rid of frame drops
post #5 of 5
Well your cpu need to be stable before you overclock your card.
My phenom@3.8ghz and stock clock on my 7970 (925hz), I was getting 80+ fps with some drop to 55 max (min max if that makes sense smile.gif in 1080p
Now on 1440p with my 4 years old amd rig I get 55-60 fps in the battlefield.
Try with a more conservative cpu oc if you dont want to waste a lot of time finding if your cpu is stable or not.
Try like 3.8 maybe, and make sure your bus speed is normal. If you only cranked up the bus you'll have issue with the north bridge memory etc.
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