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Can't OC 6800 gs

post #1 of 19
Thread Starter 
Hey all...im new to the forums and have a question about my XFX 6800 gs. It is a PCI-E card and I have been using coolbits to try and oc it a little. Right now it is at 485/1100 and is ~38 C idle and doesnt heat up too much more during gameplay. When i try to oc it, i click manual overclocking in the nvidia display and then to detect optimal frequencies. After that it will set it to 514/1600 and then i restart it to keep the settings. However, after I am playing a game for a period of more about 10 minutes (HL2, CS:S) it will start to lock up and everything becomes pixilated. The characters will change color and then im forced to change my settings back and restart.

I know heat is not an issue so im wondering why it is doin this. Thanks for any help.
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post #2 of 19
well at those speeds your gpu probably heats up quite a bit. try 500/1200 and see if that works. Also, downlaod the beta version of ATI tool and use the arctifact scanner. it will heat up your card thus simulating a load similar to a game... see what your temps are and if it detects any arctifacts at the slower speeds. if it doesn't then turn it up a bit... but that 1600Mhz seems high for the RAM
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post #3 of 19
Dunno if this'll help, but try toning the settings on some of your games down a tad, and see if the same thing happens.
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post #4 of 19
yeah sometimes the optimal settings in coolbits can be wrong. Try making your own settings and you should be fine.
post #5 of 19
Thread Starter 
right now im running the ATI Tool to find my maximum memory and core. How long does this test thing run for? its been going for over 5 minutes and so far my GPU has only heated up to 62 C.
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post #6 of 19
Quote:
Originally Posted by neo_sporin
right now im running the ATI Tool to find my maximum memory and core. How long does this test thing run for? its been going for over 5 minutes and so far my GPU has only heated up to 62 C.
usually 10 minutes or less, it may take a while though.
post #7 of 19
Thread Starter 
ha fast response, thanks

I had to cancel the scan cause i have a scrim in just a second but when it is done scanning both memory and core will it tell me what it will run best at? and will it also let me save the settings then? I looked for a readme file but it didnt come with one when i installed it.
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post #8 of 19
1100 to 1600 is just insane....a 500mhz oc!! I would have been surprised if the computer didn't lock and freeze after such a high overclock. Its quite simple actually, despite that you have a good temp, the 6800gs just can't support the clockspeeds. I would go with 1200-1300 and see if they're stable.
post #9 of 19
Thread Starter 
I keep running ATI Tool and when i do a core clock test it lasts for like 20 minutes and keeps repeating itself. Do you think i would have better luck just using coolbits and keep going little by little then scanning for artifacts in ATI tool?
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post #10 of 19
Coolbits auto detect gives a large over zealous clock always. Use that more as a high range for your card. Also, start by leaving the memory at stock and up the core until its unstable/freezes/artifacts etc. Find the max for the core first, then start bumping the memory.

Theres no way your card will do 1600, you are going to kill that bad boy. I OC'd mine using coolbits to 525/1350 and my games would lock up after a few minutes too, although the temps were low. Just lower the OC and the games will be fine. Im running 495/1250 now and never get those hiccups.
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