My power supply finally arrived, but it has no fan on the back, only a vent, but its fan (on the bottom) is 2 cm bigger than the other one. Does anyone think this will make a difference temp wise, or would i be smart to just sell this if it wont make a difference? My temp idles at around 40 right now for the processor and 38 for the case as Ive said before, but see that that is too hot, what is a good temp at? Thanks for any help.