Overnight massive FPS drop

lolzas

Commendable
Mar 9, 2016
3
0
1,510
Specs are gtx 970, i7 4770k. 16gb ram. Overnight I went from having perfectly smooth fps on any game, to having less than 30 fps on low for Battlefield 4 and other demanding games.
Drivers are up to date, I can't see nor feel much temperature from any hardware.
Did a virus scan and it's clear. Not running any additional programs (although before today I could run countless without issues).
Only thing I can see left is to a full wipe and format of the computer. Help please.
 

lolzas

Commendable
Mar 9, 2016
3
0
1,510


No changes to windows overnight as far as I know.
No downloads were done unless they were background ones.