These motherboards are a pretty good deal, though from what I can find, the price of the two is almost identical, averaging only $6-10 between the two models. With such a miniscule difference, the only reason to take the 790 over the 780 would be if you are building a very cheap system that still has a video card. Also having 100% solid state capacitors on the 790 will provide another advantage. There is an order of magnitude increase in reliability from liquid caps to solid. Anyone who has seen a blown cap knows how much of a headache that can be.