Could be that the PSU is not providing enough power to the cards, maybe faulty!
Was exactly that.. I got off the phone with Asus and they had me do some web tool that added up all the hardware that was in the case and it came up to 550W and the power supply is a 750. So I swapped in the last one we had and it works perfectly... Kind of frustrating after a week of thinking it was just a bad video card but once we finally got a new one and it still had issues it was very irritating.
Was late last night sorry I didn't post the result. Thanks rolli59.