No, you won't lose your key.
No, you won't lose your key.
Write it down ahead of time if you're concerned. Make sure it won't turn off Windows. If it does, just type the key again and you'll be fine.
I don't agree, I can verify when I submitted my 650ti that it wasn't impacted. When @Gofspar briefly added his 970 with his 980, it functioned properly. It seems the chat screenshots might have been fabricated.