Im using multiple software solutions to check the temperature of the card as well as the ambient temperature inside my case which is within the appropriate range with the 120mm Fans and coolers I have inplace. My "extended periods" are not overly long play session (usually about 3 hours). I also downloaded memtest and ran that on my system which passed with no errors. I said that the card runs at 60c at full WOW load. That means running all five clients. That is by no means that maximum for the card. Sorry I should have been more clear. When I run a full load test on my card at full load I usually get a temperature of 80c which is inline with the forums you found.

I would go the RMA route but I just tried to look up the process for xfx and their website is under construction pending an overhaul. Guess I have some more time to try and come up with a solution.

Looks like its back to the drawing board.