I'm shortly replacing my busted (but still working) PSU with a new Seasonic Focus GX-650...During some conversations i was told that is best i turn off/unplug my PC after shutting it down...Now, I don't have a main switch where my PC is plugged in and just plugging/unplugging it after every shutdown seems silly to me, so my question is: Is ok if I just turn off the switch behind the PSU? I'm currently doing it with my old PSU because emits some annoying whizzing sound while PC is off but the PSU is switched on...