I have to admit I had reservations about the CPU running it stock. I then decided to run it at 4.5. I haven't tried to go any higher. I toasted a 5930 because mostly I wasn't paying attention...
After going to 4.5 3D11 is the fastest I have ever run it. Even with 2 reg. Titans or AMD 295 which is 2 290's...I will push the chip further but for now the chip is amazing and will do things with those extra 2 cores for a water cooling guy that is amazing.