Exchange the motherboard in your system.
Exchange the motherboard in your system.
You're considering moving your system to a smaller form factor. A fresh Windows installation is usually recommended for such a swap, though some components can be swapped directly if they're compatible. Check compatibility with MSI or ASUS for the Z690 Mini ITX board.
It likely depends on your PC's licensing type. Are you using an OEM build or a fully purchased key? Do you have a home or Pro license? Is it version 10 or 11? Is it linked to your MS account? You should definitely get your product key if you want. However, the process might involve an automated phone transfer which can take about 15 minutes and may be a bit tedious, though manageable. From an admin CMDC perspective, the system will retrieve the original product key regardless. Overall, Microsoft is quite accommodating with OS licensing for personal use. Good luck!
You can simply replace the board. But first, remove all the motherboard drivers (such as audio, Ethernet/WiFi, chipset, SATA, etc.), swap it out, and install the ones that match the new board. You might need to adjust the Windows license key, as @OddOod suggested. Unless you want to reinstall Windows, this is mostly enough. You don’t have to reinstall Windows, but you could use it to clean up unnecessary files, registry entries, and leftover patches.