I'm overclocking my Radeon HD 3850 using ATI's Catalyst Control Center. I let the Auto-Tune feature run and kept the settings. I was pushiing 110 C while running Starcraft 2 on High with the Auto-Tuned settings. Is this too high? What should I aim for?
110 C = scary. You hear a lot that 60 C is the point above which damage can occur. That's not quite it, a more accurate assessment would be that 60 C is the point above which your graphics card starts getting gray hair, meaning its service life gets shorter. I'd try to keep it below 65-75 as much as possible, depending on how willing you are to replace it in 6 months. I think at the 110 point, though, you would be looking at artifacts or complete failure in a month or two.