What components can I change in my system before I invalidate the OEM License?
There is a general consensus that the OEM license is paired with the motherboard. You can generally change any other component bar the case where the COA is attached. If you change a significant amount of hardware you may be asked to reactivate, but this doesn’t mean that you are necessarily unlicensed.
However, you can change the motherboard under a warranty claim if the motherboard was faulty. But, if you are simply upgrading for feature or performance enhancements, you would need a new OS license.