Originally Posted by
Raist
If you can only get Analogue signal to work, then there is something wrong with your hardware. The fact it cleared up briefly when a cable was changed is a usually a pretty good indicator as well. May need to try it with a different monitor if you can, just to rule that out.
Something else you could try I guess... you said you were running 1080p at 60hz. Have you tried to override the refresh just a tad, like 59hz, or maybe running an interlaced refresh rate--just to see if the pattern changes? This may apply somewhat towards answering your last question:
Did you make sure your power supply was sufficient to run the card at full throttle? XIV hammers the piss out of all of your PC's subsystems at once, so much more so than most any other game on the market that are much more optimized. If your PSU is just on the cusp of not providing enough power for the GPU while the system is under heavy loads, you can experience all kinds of odd behavior---a slightly out of phase refresh might be one such side effect.