hi guys i need help deciding on a new psu. the prob i have with the paxpower i currently have is the fan throbs even if the load is constant although the fan is quite quiet its still the loudest thing in my case even though its rated 18dB. i need one which has about 5-6 hundred watts output, decent efficiency and very quiet. any suggestions most welcome. i was thinking maybe enermax liberty or a seasonic 600w.