E-machines are pure crap, they utilize the cheapest components available, really for that matter ANY retail computer is crap. Compaq,Dell,Gateway,IBM,Sony etc etc. all integrated most components onto the motherboard, IE sound,video. So yes they do not need as hefty as a power supply, hell when I worked at gateway we had a P4 2.0ghz that ran off of a 150 watt power supply.