ok i have never swapped a motherboard before i know how to physically do it but im unsure if i can do it without having to reinstall windows im running windows 8.1 on a gigabyte ga78lmt-usb3 i wish to switch it with a ASUS SABERTOOTH 990FX R2.0 so i can run SLI but i dont want to reinstall windows it would be a pain in the butt because most computers dont come with a windows CD anymore not to mention i dont wanna have to re download and re install all the games i got online for free with my graphics card they are very big games and take up my bandwith usage for the month and honestly i dont know if i can download them a second time.