[Terranova]

Come to find out my 8800 is capapble of clocking at 700/1800/1000 just fine it was stable for 3hours in ati tool and while doing 3dmark 06. The emps stayed at 58 celsious practically the whole time until i put 2 instances of orthos and prime 95 on while ati was running. The temp on the card stayed inbetween 58-59 but RIGHT as soon as the temp hit 60 celsious the 3 hour stable turned into artifact heaven. Is 60 celsious like max for these cards or what? I need to get another cooler for this thing gah....my temps were never this high until i did that stupid volt mod *rolls eyes* but i knew before hand this would happen oh well more clocks for the heat i geuss.

[jivetrky]

Actually I'd bet your problem is a lack of power. When you run the Orthos, your CPU is now sucking a ton of power and your 8800GT wants a lot of power as well and it getting starved. That 420W Powerstream probably can't cut it.

[onefstsnake]

Yeah my 8600GTS runs around 75* at full load.
totally different card but still.

Go pick up a sweet 600w psu

[jivetrky]

Oh and to answer your question, No, there is no certain temperature at which your card will start artifacting, just has to do with how the chip runs as those speeds/volts. Of course if it was running really hot, that could cause issues, but 60c is not hot at all.

I'm pretty sure your problem is the PSU.