How much power????

A motherboard will draw a certain amount of current, just like any other device. The board requires a certain minimum to post. Too much is not bad for the board; get a good brand such as antec, corsair, seasonic, enermax, pc power and cooling or ocz. A cheap brand will weigh less and may smoke if overloaded. How much you need depends on your total system requirements for everything else, such as the hardrives and video cards. If you list your complete system specs, you may get some suggestions.