As succinct as possible:
1. I have 2 computers - one running Windows 7 Pro x64 (main computer for work and gaming) and the other running Windows 7 Ultimate x64 (second computer)
2. Both Windows 7 installations are OEM.
3. The second computer has been sitting dead for close to a year because the motherboard died and I have not really wanted to spend money getting it running until now.
4. The route I am taking is to upgrade the main computer (motherboard, CPU, and RAM) and put the current "main" motherboard, CPU, RAM into the 2nd computer.
Logic would dictate that I ONLY upgrade the 2nd computer and make it the main computer. However, the Main computer has an SSD Hard Drive in it and the 2nd one does not. So, I'd prefer to keep the SSD HD for it's speed. That's why I've chosen this convoluted replacement process. There are other reasons for the convoluted process if you need elaboration let me know.
I did see a person ask about upgrading and keeping their license. I'm not sure if Microsoft views reasons for hardware changes due to failure differently. I suppose it's a matter of luck?
And thank you all for your time/effort.