The threshold for a 6600GT is 145C mate, your well within the range.
Is the card under warranty? If so, I'd contact the manufacturer or the supplier. I would NOT change the thermal paste or the heatsink if its under warranty, as that would destroy the warranty.
How many case fans do you have?
Is the card under warranty? If so, I'd contact the manufacturer or the supplier. I would NOT change the thermal paste or the heatsink if its under warranty, as that would destroy the warranty.
How many case fans do you have?