i have a bfg 8800gt .i have been overclocking since i bought it last yr.its stock clocked at 625 core and 900 memory.i never oc the memory because i heard its easy to mess your card up.i run the core at 690 when im playing games (cod4) mostly.lately its getting hotter than usual (95c)and i get some artifacts.am i killing my card?is that way to hot?normally it runs around 63c