Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
I did this before, not to check temps but to troubleshoot a display issue. I can't remember 100% but I believe it rebooted and after booting up it sorted itself out after a few seconds. I think it will automatically detect the cards and install the driver itself. Give it a try, it went fine for me and nothing went wrong. Hopefully it is the same for you, but YMMV.
When i dropped my second 580 to the bottom spot due to temps i did have to re-install, however i am running surround. Worst thing that happens is you re-install takes 5 minutes, give it a try.