why amd retail fan isn't in those comparison review?

[Kingofcomputer]

my bios and mb program reports my duron retail fan is 8000rpm,
I suspect its performance should be as good as those $20-30 hsf.

 

[Mikewarrior2]

actually, it probably isn't. If its the coolermaster with a 50mm fan, it is significantly worse than the $20-30 heatsinks.

If its a taisol unit, then it might be a cek733092, which performs better than the c-orbs.


Mike