I have the ICG-7 with that Abit fan on NB.
After hearing much complaiing about NB fan noise, I tried disconnecting the NB fan for a minute and compared the sound difference. With remaining noise from the stock Intel CPU HSF and the fan on my Gainward Ti4200 GeF4, I could not tell the difference.
I think some people's fan may be louder than others.
I do have the new revision Abit NB fan on order (arrived today) just for the heck of it.