ok thanks and i have one question i dont need crossfire for the second slot now right? and also... i know this is gonna sound very stupid but i am very new to this so when i build the system, to install the OS do i just put in the dvd into the dvd drive? lol
For the motherboard you will have the primary PCI-Express slot that you will use for your HD 5770, the second one is not for another Video Card, since its only a 4x slot and it needs to be at least 8x to run Crossfire. This isnt a problem though, because you dont have 2 video cards.
And to install the OS, just put the DVD in the Drive and it will automatically start the installation.