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So, it's not tied to the motherboard? Must not be.
In a quick thing if you didn't understand that..
OEM you can be reinstalled on multiple different hardware configurations. MS has no way to track if you kept 1 piece of hardware in your system or not.
All you do is lie to these people tell them its the first time using the key. I do this all the time they never ask questions. Friends do it all the time as well with oem copies transferring them to other computers. I don't think they can tell what hardware you actually changed. That would be invasion of privacy. As long as you say its the first time you are installing this key onto a machine and have it on no other pc's you will be str8. Also never tell them you want your key to go on a different machine just tell them its your first time using it.