I've got a Radeon HD6870 (Powercolor) and It's only been running for about two weeks, I haven't noticed anything wrong with it at all, but it does get a bit hot for my liking, GPU-Z reports:
                     Temp 1: 68.5C
                     Temp 2: 79.5C
                     Temp 3: 77.0C
                     Voltage: 1.17V
Is this normal? No overclocking, I just want to know if anything will happen due to these temperatures, as I am an avid gamer on this PC.
GPU Core lock is at 900MHz and the Memory clock is at 1050mhz, getting 250-270MH/s