Originally Posted by DjNDB
Something is definitely wrong with your graphics cards cooling. Maybe the heatsink lost contact to the chips?
Or maybe the fan isn't turning at all? Or maybe it's so clogged in dust that there's simply no airflow going on?
Come to think of it, the log file mentions the fan speed being at 100% - if that were my Radeon 4850 it'd sound like a hair dryer was inside my PC; but if you're not hearing something similar it has to be the card's fan not turning...