i am going to be cooling a QX9650 pro (not overclocked) and two 9800 gx2 gpus (not overclocked). Im not sure if i should go with a 1,2,or3 fan rad. the one fan can handle 400w, two fan 700w and the three fan 1000w. So i guess my ? what is the smallest rad i can go with and still have good temps.