Yeah, I don't know if I'm just unlucky, if having the fans pegged at a high speed, or if there is a design flaw / bad lot with the Twin Frozr fans on the 560ti cards. Both of my cards have failed twice even though it was apparent that at least one of the return RMA cards had a brand new cooler on it, and the only real saving grace has been the speedy RMA process for them.
I'm not sure what to say to you about it, I personally avoided twin Frozrs when I was looking for a 680 to order because of it, but then again, other folks have had a lot of luck with them.