I myself, also have problems with divider 1.6+ and 2.0+ in BIOS 12B06.
Need more info what fsb are you running with Ram timings & voltage??

the PWM's temperature still get ridiculously hot at maximum about 72C
what vtt have you set??
either try making some retension wire from bending paperclips, or find somwhere to wedge a fan that fits. I'm running atm with a60mm fan that wedges in between my heatsink retension bolt & the back of the case.
Rubbish picture but you get the idea