well if you have the space get a GTX h100i GTX or whatever they call it now ( the corsair double 120mm radiator.) if not go for the H80i, it will work up to 4.5, after that it is hard to stay. the H110i GTX is the best, and sometimes priced very competitively, but that things can be hard to fit in some cases. If you really want to go super ahed core there is the thermaltake water 3.0, but that is sort of pointless unless you have a 9590.