Its not only about Heatpipes, but the design of the face (to reduce static pressure from the fan) and the way its designed...
right now, my Coolermaster Hyper 212 Plus is hitting 46 degrees max on prime 95 (with a virus scan running)
when i get my i5, i will see how my HSF will handle the load, and if it cant handle it that well, then i will go for a TRUE 120 Black, Venomous X, or this...
Although i really like the HDT (the heatpipes touch the CPU directly), i have read that they are not very good for high heat applications ie i7...
If you want fans that move ALOT of air, try the Coolermaster Sickleflow fans. Wow, those things motor...
My computer Has 4 exhast fans, 2 intake. My 2 intake fans (sickleflow) are the strongest (although my rear exhast fan is the same thing, and its blowing onto HDD's, so i basically have 1 strong intake fan) The rest of my fans are quiet, but move air well
I found this was the best result on my case...