The voltage swing on the 3, 5 and 12 volt lines was .06, .04 and .24 respectively which indicates that the the Ultra 600 watt Power Supply falls safely within the 5% voltage tolerances so many consider to be the grail by which to judge the worth of a power supply. The dual 80mm LED fans do provide a nice touch to the front and rear of the case and will make for some interest eye-candy on a windowed case.