philippe landau wluheuserlandorg randall r schulz wrote saturday 09 february 2008 1008 philippe landau wrote many power supplies efficient dont operate close full load seemed counterintuitive decided little looking around according graph page 14 power supplies hidden opportunity energy savings case much depends power supply question today would recommend buying one 80 efficiency often reach 85 efficiency operate around 50 load power supplies 101 comprehensive guide motherboardsorg httpwwwmotherboardsorgarticlesguides1487_7html study quote may bit outdated 2002 valid cheap psus compaq certainly good check characteristics psu buy one httpwww80plusorgmanupsumanu_psuhtm seen earlier thread calculating power consumption needs components used always easy kind regards philippe switching powersupplies efficiency peak producing 50 maximum rated output however curve low side efficiency peak much steeper high side suspicion mostly correct psu twice capacity called supply waste significantly power one used 50 100 range kind regards philippe randall schulz wed 06 aug 2008 013357 0100 opensuse power supply psu efficiency unstable system culprit