Well, I own the Zotac 560 oc.
At stock clocks, it reaches 73C @ 44% autofan after 2 rounds of Heaven. It reaches 64 C @ 60% manual fan speed. Anything over 65% fan speed will begin to sound like a mini vacuum cleaner, especially when you're about 30 cm away from your PC. I haven't taken the cooler apart, but I can clearly see 3 heatpipes inside the shroud.