How many case fans do you have? just curious to know.....If anything I would thats if there is a free slot under the AGP which should be Place a decent blower to assist the card out abit...My friend also has a 6800 GT started running into the same situation I suggested that and it helped alot...for some reason when he was cleaning he kinda put a few fans backwards and the air flow in the system was choking abit aswell so there was alot of heat floating around in the system a good airflow keeps a system cool