Phenoix BIOS

ok, I dont know a better forum then Kirupa so im posting here and hoping for some help. I have a graphics card and i get an alert POP up thats says its not getting enough power. I have a 350 mw power supply, but people say it might be a BIOS setting. I have Pheonix BIOS, does anyone know how to change it? Help would be greeatly appreciated, I’ve been very frustrated with these thing.