My experience has been in the past.
If you change motherboard or video card you will have to call for a new key. They have always given me a key for the retail ver. and deactivated the 1st. If its the same then there should be no changes. just same.
The reason I asked is that OEMs are only good for the original system it came with. I haven't tried what Tremmor suggested though. Now I know it's possible.
My experience has been in the past.
If you change motherboard or video card you will have to call for a new key. They have always given me a key for the retail ver. and deactivated the 1st. If its the same then there should be no changes. just same.
You can change video card and not have to reactivate, I've done it. A major hardware change would make the reactivation come up, like changing video card, sound card, processor all at once.