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7950 OC - Cannot reach good results!

post #1 of 7
Thread Starter 
Hello,
Im trying for a long time to OC my 7950, but it's not stable at all.

I've looked here, and seen the results of the users:
http://hardforum.com/showthread.php?t=1679776&page=5

I tried to raise my voltage to 1.2, and the problem is that the memory causing crashes after 1350, which i've seen users could reach to 1500 and higher.

Anyway, when I use 1.2v and 1130/1390, and start far cry 3, the driver is crashing and I must restart the computer.

What am I doing wrong?
post #2 of 7
What PSU are you using? Maybe your Graphics card just isn't getting enough juice after you've overclocked it.
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post #3 of 7
try to OC one at a time. first the clock, see how how high you can get it stable, then the memory.

if afterburner not working for you, try trixx

btw, you can go to 1.25 without any worry of damage to card, even 1.3 if you want, just need adequate cooling.
     
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post #4 of 7
Thread Starter 
I use Seasonic x-650 psu.
I tried trixx, but I have to OC it everytime I power the computer on.
post #5 of 7
Quote:
Originally Posted by talbe1992 View Post

I use Seasonic x-650 psu.
I tried trixx, but I have to OC it everytime I power the computer on.

Use MSI Afterburner, it's much more user friendly and I guees around 90% of OCN users use MSI Afterburner.

You might be having Driver issues, or a dud binned chip
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post #6 of 7
try overclocking just the core first and then just the memory. you may also just have gotten unlucky with your chip and you may not be able to reach 1130 on the core. my 7950 for example needs 12.62 volts just to reach 1075 on the core. try 1100 on the core with the memory at stock , at 1.2 volts and try to raise the volts abit if keep getting driver crashes. then when you find a stable core clock try the memory with the core at stock.
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spinpoint caviar blue noctua nh d 14 x-star 1440p 96hz 
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post #7 of 7
OP first keep memory at 1250 Mhz stock speeds. Overclock your core with voltage tweaking and get to your max stable core overclocks. memory overclocking is not so important because HD 7900 cards have huge bandwidth and are not particularly bandwidth constrained. If you can run at 1100 - 1125 Mhz core and 1250 Mhz memory completely stable in all games that should be enough to match HD 7970 Ghz performance. also monitor core and VRM temps while testing your overclock stability. Use heaven 3.0, 3d mark 11 and games like BF3, Farcry 3.
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