Alot of talk goes around on these forums and many others about what a "safe" GPU temp is. Most people you will ask will say keep it under 70C or i don't like anything in my case running over 60C. This is bunk, BS, whatever you want to call it. All current GPU's since the Ti4x00 series from Nvidia and 9xx0 for ATi have been able to handle 100C+ temps. current cards are safe running 24/7 at 100C. G80 and up are rated to fail at over 120C. this means at 90C your card is doing just fine! When you oc on a reference cooler the GPU is not what will fail you will loose the VRM's or capacitors way before the GPU as it will throttle itself down if temps become to high. A video card at stock will not fail due to overheating without an external problem. Things like bad air flow, (read this for help with keeping you case cool) dust, improper installation that damages a heatsink, or even an unplugged heatsink fan. New high-end cards run hot that's the way it is this wont change with out a major revamp on core designs.