I've recently built 3 i7 Hacks w/ retail installs meaning the extensions folder is left untouched for easy updating. Compatibility wise Gigabyte boards are the best for this and usually Nvidia cards are preferred. Your 5 series card is not supported, maybe in 10.6.4 and you'll need to figure out what Ethernet controller and audio is used on your board. You can PM if you want more details.