1 minute ago, PandooZa said:
So what I can do, please correct me if i'm wrong:
1. Make a USB boot drive.
2. Swap the CPU/Motherboard.
3. Boot the PC on the USB boot drive.
4. Hit clean install on C drive (Boot SSD).
5. And log in with my Microsoft account so my Windows 10 will be activated
Is that about it?
Pretty much! You'll need to run a format on the boot SSD, but that's achievable through the install GUI.
Windows won't touch your other drives on installation.