I'm running a BFG 8800GTS 640MB graphics card on my Intel Quad Core Q9550 desktop, 4GB RAM. Recently I've noticed performance degrading in gaming intensive sessions where the game starts off with a 60 FPS but then once I get 20-30 mins into the game, the graphics start getting a little choppy and frame rate drops to between 19 and 40 FPS. The games are still playable but not as smooth as when I first launched it.
What could be the possible reasons for this? One reason I've thought of is the heat buildup - the card often gets as hot as 110 Deg C. Are there any other reasons and what can I do to fix this?