I just upgraded from a gtx 970 to a msi gtx 1080 ti duke. my monitor wont display at 60 HZ in 4k anymore. it worked fine when doing it with my gtx 970. i have a samsung u28e590d 4k monitor. I updated the drivers for the card but now the monitor will only display 30hz in 4k, i dont know what to do so any help would be appreciated