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Performace Problems in 3d games

I have been running my new rig for a few days and have been running half life 2 and ut 2004
at 1680x1050 all details max vsync on 8x af and 0 aa. Prime stable for an hour.

Normally I get 60-59 fps solid but recently after 40 minutes or so of play it has started slowing to 30 fps or less randomly, some times during simple scenes and some times during complex scenes.

Any ideas besides lowering various hardware speeds as I have tried that.
 
I used to get this problem as well when playing Doom3. It would run fine for some amount of time, then just slow way down. This seems to indicate that you don't have sufficient air flow in your case. I dusted mine out and it helped a lot, but you might need more fans or to relocate your case somewhere that isn't so enclosed. Hope that helps.
 
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