i have made one out of a pentium 4 heatsink by boxing it up and having the two hose coming out and i have seen the ones using the bottum of pop cans and the ones with copper ends, is there one that stands out performance wise i would think that mine would because it actually flows water through the hink sink and should keep it alot cooler (in my opinion) because other wise you would have a water block on top so you would figure a waterblock / heatsink would be the best????? anyone know for sure and if so why is it better