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Help: extremely inconsistent overclock performance

post #1 of 6
Thread Starter 
For a while 900/2300@stock volts ran great, tested with furmark then played hours of battlefield 3 beta. I stopped using furmark and switched to unigine heaven. I had to up the voltage to 1.1 for those clocks to run stable in unigine.

I ran 940/2300 for 45 minutes without issue in heaven. Then I tried core 960, it failed, and I have not since been able to get anything over 900 to work for even a minute

however I did get 900/2500 running for 3 straight hours just fine in heaven, no issues. But this time around (and this is what gets me) battlefield 3 craps out in one round. I stepped it down to my origonal overclock of 900/2300 which I used for many hours straight in battlefield 3 before I ever touched my voltages.

Now, at 1.1 volts, 900/2300 in battlefield 3 I get these massive GPU usage drops/hiccups. I took a screenshot of my GPU usage.



I really wish I could have stuck with 900/2450 because my performance was insane in BF3 before these issues came about

any help is very appreciated...

p.s. drivers are the latest beta for BF3
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post #2 of 6
I run my Ti @ 1Ghz Core with 1.111 volt.
There is something wrong with your card even thought each card is different.

I see max temp is 88*C is that correct ?
EDIT: Lower your memory speed I think it's your problem, mine is at 2100 and as soon as I start fussing with it, it glitch.
Try 1.1 volt with 950mhz Core and 2100Mhz Memory
post #3 of 6
It's generally a good idea to OC your core independently of your memory first. Core/shader clocks contribute to overall performance much more than memory on Fermi cards, and clocking your memory too high can lead to instability, even if it doesn't show visible artifacts.

I'd set your memory to stock and see how high you can get your core first, then adjust your memory accordingly (if at all).

Also 88c is really warm for a single 560 Ti, even in SLI my top card never gets that hot.
post #4 of 6
Thread Starter 
I initially overclocked the core, but that was without ever using any voltage over stock.

I have actually (based on Unigine Heaven scores) seen much better scaling in overclocking the memory versus the core. But, as you said, it is apparently quite unstable... I decided to reinstall my drivers clean, and set it to 900/2450 at 1.15v and let it run furmark for 1 hour, which passed fine, and then I started up Unigine Heaven and will let it run while I am at my night class.

If that passes then I will test battlefield 3 one more time. I am hoping that the issue came from driver issues after the times that I pushed my overclock too far.

Is it possible for increased voltage to actually be the culprit for decreased stability? Because only on the most recent attemp at battlefield 3 did I ever see such inconsistent GPU usage %.
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post #5 of 6
Dude there is no way your memory is going to be stable at those sorts of speeds. I'd be surprised if it was stable any higher than 2.2Ghz.

As Booty said, just stick to ocing one variable at a time, and you really should worry about the core first, get that to a level that you are positive is stable, then second if at all worry about your memory OC.
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post #6 of 6
Thread Starter 
Quote:
Originally Posted by juano View Post
Dude there is no way your memory is going to be stable at those sorts of speeds. I'd be surprised if it was stable any higher than 2.2Ghz.

As Booty said, just stick to ocing one variable at a time, and you really should worry about the core first, get that to a level that you are positive is stable, then second if at all worry about your memory OC.
It was stable. I ran unigine for 4 hours at 900/2550 with zero issues and my highest scores. However, battlefield 3 couldn't handle it. I have since throttled wayyy back. I learned that many people have bricked thier 570/580 with too much memory OC/or had permanent artifacting even at stock clocks afterwards.

So... thanks all for the help but I'm going to accept this card for what it is and keep it modest. 900/2180/1.11v

I have found a real sweet spot for BF3 graphics too. Get 60FPS at all times on caspain at 1920x1200 and it looks jaw dropping.
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