My motherboard is not SLI-compatible. My brother's, however, is compatible. He does not plan on getting SLI, but I have an extra GTX 970 as we speak. I have thought about switching the motherboards along with the hard drives so no OS reinstallation is needed. The problem here is that my brother's copy of Windows 7 is OEM, and he refuses to upgrade to Windows 10. OEM's are bound to the first motherboard it is activated on, correct? Do I really need to buy a new license because I need to switch motherboards?