My brother has a acer aspire x3400g computer and wants to install a pci express x16 card but I belive it has a 230 watt power supply. The info from the sticker on outside of case says 100-127/220-240 VAC 6/3A 60/50HZ. hes just looking for something better than his geforce9200 onboard graphics. I myself have no idea on watts and such but I know how to install the cards.