You may change other components such as hard drives, RAM, display cards, etc...even the CPU. This won't mean you may never have to activate the system but the motherboard is the key component. I do know that OEM builders have a way of changing the MB with an OEM copy of Windows but it must be their little secret. Obviously if they need to replace a defective board within the warranty period you won't be charged for a new copy of Windows. As for full OEM copies of Windows at Frys, these are meant for builders making PCs for purchase and not for themselves. It will be the same as full version retail but with a different volume number and a product ID code that works only with that issue of Win7.
no longer belong. In other word, what hardware can I change before the OS says I don't work here anymore.
Something else that I come across at Fry's I thought a bit illogical. It says (FULL) windows7 (oem) version. I thought now-a-day all OEM OS are full version, unless it mean one has a disc and the other do not.