I have a 480 watt Enermax Coolergiant power supply. My question is my 12v rating? It fluctuates between 11.673 volts to 11.734 volts quite a bit. My 5v(5.19) and 3v(3.31) almost never fluctuate maybe +- 1% . Is the 12v Rail good enough? Safe? Its my understanding that the 5 and 3 volt ratings are the important ones. Is this correct?