ok, I have a micro ATX tower, its kinda old and I was wondering if its possible to change my power supply. The new mobo I am planning to install in my tower needs atleast a 300 watt power supply, and my current ps isn't up to snuff for the situation. Other question; our all power supply's roughly the same size? Like would a power supply in my brothers atx tower fit in my micro tower? any help would be greatly appreciated, thnx