this one (reference design):
http://www.geeks3d.com/public/jegx/2...lit_gtx480.jpg

or this one (with custom cooler):
http://img.donanimhaber.com/images/h..._1_dh_fx57.jpg

Either way you can overclock your card but with custom cooling solution you will be able to overclock a bit higher without raising temp too much...after each raising (youll need to rasie a voltage a bit) run benchmark tool (such is 3d mark) and check for possible artifacts and check for temps....