<< The IWILL KK266 has a passive heatsink on the North Bridge, LIMITING it's overclock potential... but just stick on a fan. not a big deal. Anandtech reviews said just putting on a fan made it overclock better. >>
According to the Iwill forum over at amdmb.com, adding a fan to the northbridge does not help in most cases. YMMV with an added fan.