^^ not all. most Phenom II X4 (or Phenom II X2 also) HSF have noise problem. & some can't even keep the temperature under control. but Cilus used to run his processor at 500Mhz+ over stockspeed using just the bundled HSF. totally a luck thing.
Its not like that. I think you are basically refering the incident with Pulser_Swift. There may be a lot of heating issues due to the improper use of the cooling paste or improper install of the heatsink which is completely users' fault.
Now I am using the Phenom II X6 1090T and it runs just fine @ 3.6 GHz without any problem. In the Asus Power User meetup, we have met a professional overclocker named Anant, who informed us the Thuban can be oced upto 4 GHz with stock cooler.
After that I've tried it in home and he is right. If possible I will post some benchmark and temp ratings.