Re: AMD 6850 problem...... help
It will either be a faulty card, or a fault with CCC.
When not under heavy load the card underclocks itself to save power and reduce heat, and when it starts to get used and the load increases, so too do the clocks. The majority of the time it works fine, however sometimes it causes the drivers to crash as it under/overclocks as the loads change.
Try fully uninstalling CCC and the drivers and reinstalling them. If that fails, I would say either a software conflict, though finding it is like finding a needle in a haystack, or, as you mentioned, a fault with the video card itself. Audiosurf isn't very demanding, so won't necessarily need the card to knock the clocks back up, it can run on the settings you have it at with good enough performance with the lower clocks.
If you have space on your hard drive, set up a second partition and install Windows on it. Install only your drivers and a few of games and see if it crashes. Even if it crashes first time, try the other games, it may be specific to that one game. If it doesn't, you know it is a software issue on your other drive, rather than hardware. If it does crash, chances are it is a hardware problem, not necessarily a fault, it could be a conflict.
To test if it is a conflict rather than a fault, the only way is to swap out components to/from another, known fully working computer
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