Here is a tip for prescott users:
The stock HSF for LGA775 package prescotts, is the best cooling solution for air cooling.
For 478-pin prescotts, an aftermarket HSF*high rpm/high CFM* with AS5 is the best air cooling solution.
*as of now, I am trying to find someone/benchmarks, of a stock lga775 hsf that has the pad off, and replaced it with AS5*