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Terrible overclock or am I doing it wrong? (Sapphire 7970)

post #1 of 6
Thread Starter 
Hey guys,

I recently bought this card:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202008

I game at 2560x1440, so in order to stay as close to 60 fps as possible I would have to overclock to max everything in games like BF3 and Skyrim with mods and enb. This was the first time I tried overclocking this card. First I enabled overdrive in CCC and set power control settings to 20%. Then I tried what many consider to be a base overclock for this card at stock voltages, 1125 core/1575 memory. TriXX is what I use to tweak clock speeds and voltages. TriXX says my VDDC is 1175, so I'm guessing that's the stock voltage of this card?

With these clocks, I try to launch BF3, but get a black screen then it goes back to desktop. I tried upping my VDDC to 2000, and I was able to get in game, but only for a couple seconds and I get the same black screen again. And I get no message that my video card crashed, the game doesnt even crash. It just goes to a black screen and minimizes out of the game and I have to ctrl-alt-delte and end task in order to click anything. Am I doing something wrong, or is this just really bad luck?? frown.gif Any advice guys? Thanks!
post #2 of 6
What voltage have you tried? there is no way you tried 2000mV and your card is still alive. otherwise your card is a past history now.
I guess you mean 1200mv?
Try lowering your overclock. First aim at your max core overclock once you found out your rock stable clocks, then aim at your memory overclock.
Try increasing the core by 25-50 MHz until the GPU crash then drop it by 10-15 MHz until it stabilize, same thing with memory.
You can use synthetic benchmarks like Crysis 2 Loops, Crysis 1 Loops, 3DMark11 & Heaven as stress tests. and then you must test your card in practical situations to make sure your OC is stable under all conditions.
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by HeadlessKnight View Post

What voltage have you tried? there is no way you tried 2000mV and your card is still alive. otherwise your card is a past history now.
I guess you mean 1200mv?
Try lowering your overclock. First aim at your max core overclock once you found out your rock stable clocks, then aim at your memory overclock.
Try increasing the core by 25-50 MHz until the GPU crash then drop it by 10-15 MHz until it stabilize, same thing with memory.
You can use synthetic benchmarks like Crysis 2 Loops, Crysis 1 Loops, 3DMark11 & Heaven as stress tests. and then you must test your card in practical situations to make sure your OC is stable under all conditions.

I'm not too sure the setting I changed is called "VDDC" in Trixx. I assumed that was how you tweak the voltage.
post #4 of 6
It may be because you are using both programs. Just use trixx or ccc. I had problems while using ccc and afterburner both at the same time
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post #5 of 6
Hi,
Best practice is to use just one program. adjust power slider all the way to +20% then focus on just your Core clock speed without adjusting voltage. then adjust voltage to find your max core clock speed. Dont touch memory while ur doing that. then once u find that max for your core.. start bumping up ur memory slowly. and run ungine heaven benchmark as a stress test and watch for artifacts and tearing etc...
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post #6 of 6
BattleField 3 acts funny for me. I have to keep my mouse hovered on the taskbar and click on it as soon as it shows up, otherwise I get a "Display driver has stopped..."

Maybe that will work for you?
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