From what I hear the Microcool Northpole Northbridge cooler is suppose to be
one of the best coolers on the market. The Crucible has it up for review and
gives you their opinions here.
If you are looking for the absolute best available northbridge air cooling
available make sure you check out Microcool's NorthPole. While it will put a
pretty good dent in your wallet, it performs as expected or better. Microcool
has done a very good job on the NorthPole northbridge cooler set, and already
other manufacturers are following their lead.