well, you don't need to get a motherboard with more than 1 pci e 3.0 if you don't intend to crossfire your GPU. For the price you are looking at, though Asrock makes a decent motherboard, I would recommend ASUS over them. Same price range (starts from $139 to $189) and I believe they are a more reliable product. if you HAVE to choose between the two, go with the cheaper one, as the extreme 6 is more geared for multiple GPU setups, so go with the PRO 4.