Thank you! Yes, i was afraid of that as well, but that didn't seem likely since the card is maybe a year old, and it's working perfectly in other games and also while stress testing in FurMark. It's very odd indeed, i've updated my drivers to the latest stable release, the latest beta release, i've uninstalled the drivers and all remaining files with DDU and reinstalled it, but no sigar.
Thanks for the suggestion, i did already changed all refresh rate settings and tried it with v-sync on and off. It's not screen tearing, i've had screen tearing before with some games which was easily fixed with turning v-sync on. And screen tearing looks quite different, that looks more like the upper half your screen is not keeping up with the lower half of your screen. What i have is some kind of glitching, i think GPU or engine related or something like that.