Originally Posted by DJ-CHRIS
However motherboard, video card and network card have to be the same.
Actually thats not correct you can get away just fine with a different NIC and Videocard. *unless these are integrated*
Its just like powering down your system and swaping the graphics card, then booting it up. (all you need to do is install the correct driver and your good to go)
Its the motherboard that will give you the Biggest problem, but you can still accomplish it, with a windows Repair.