A:AnswerIn these prebuilts you will most likely get a 300 watt power supply, in systems like these it is most likely that you will need a bigger power supply but if you find good ones on sale you can get good ones for under 50$
A:AnswerUnfortunately not. There are only 2 HDMI ports in the back of the device. Unless you want to plug one monitor into a DVI port and the other two into the HDMI but I honestly have no idea if that would work without issue.