Some of the Alpha coolers seem to work better with the fan sucking instead of blowing. I have a GlobalWin FOP and experimented with the fan mounted both ways. With my system, it cooled best with the fan blowing onto the heatsink. Also, if that Delta 38 fan is too loud, do what I did and mount a 80mm fan onto it instead. Much quieter with as much if not more air flow (depending on which 80mm fan you use).