i have 2 pg278qr monitors and one pg278q. all hooked up to 1080ti in sli. my most recent 278qr wont go passed 85hz. anything above that in nvidia control panel causes the monitor to go black and show a no display port signal. i put in a spare 278q in its spot and hit 144hz without issue. display port cable is known working and stable. is this an issue with the monitor itself not being able to push passed 85hz?