if you have a 6800 in the top slot the fan is gonna suck 50c air off the mosfets and ram right into the chipset ouch
the nforce 3/4 chipest is in a really bad position. with a nv5 silencer i have a via nb hs and i had to bend some pins to allow for clearance.
i think wel will all have to go to water/ chiller/phase just to get away from the chipset