good cooling is a msut for overclocking. to attain high speeds, a good heatsink is needed, or even watercooling or peltier cooling. some of the better ehatsinks i can think of ofhand are the mellenium glaciator and cak38. even with good cooling, youll eventually hit a wall that is determined simply by the cpu ability, but to get near that you need excellent cooling. athlons also run hotter than pentiums, so you need the big bad ehatsinks to dissipate this ehat. case cooling is also important. a few case fans maybe 90mms or even 120mms are nice ;-) even flow both in AND out of the case is required, as too much going in either diretion can actually hamper cooling. i always try to keep my athlon running about 41 degrees idle, but you can get lower with the btter heatsinks out these days i might think.