Does anyone know what a reasonable max temperature for an OC'd Asus 5850 DirectCU would be? I get around 71c if I push it to 775/1150 from 725/1000. I haven't really tried pushing it harder but it seems to be stable there. Supposedly I can get it closer to 800/1175 but I don't want to risk anything until I am sure.
71c is perfectly normal for a gpu.
Gpu max temp can go above 100c...however you might want to stay below the 80c range.
You can use the afterburner software to turn up fan speed during oc to fit your requirement