Is VS 450 enough for this ? I kept cx 430 in pcpartpicker because it wasn't available there. And How to Crossfire(dual graphics) ? Its my first time. Do I need to install graphic card directly or after installing os ? Please give me detailed instructions. Its my first time.And also I am downloading a windows 7 bootable ISO. Can I make a bootable flash drive through it and then install os on the newly built pc? (this is my old laptop through which I downloaded) Thank you for those who replied.