I will soon get my HD3870X2, and I would like to know if it's a good idéa to change the stock cooling/fan(s) on it. If yes, to what? If no, why? It's an ASUS Extreme QUAD DVI card, I'm not sure if it's even possible to change the fans.. But I did it on my Radeon 9800SE as soon as I got it. Is it smart or even worth to change them on this one???