the OEM version is Tied to your motherboard, so you can install it once on a system and then its tied to it, you cannot reinstall to another system and if you change your current system your liscence becomes invalid.
it also does not include tech support from Microsoft, or a warranty. what you are buying is just the right to use W7 on a specific machine. nothing more.
thanks for the info and sweet specs . nice to see others that have a gigabyte mother board