get aftermarket heatsink...
use Arctic Silver 5 thermal paste...
put more case fan...
ehh =) if i dont put thermal paste? and my case supports 2 fans max >(
erm...i hope you mean GHz for some of those and not MHz
thered be no point in opverclocking a 2.8mhz cpu.
also, cpus that are that slow don't even need heatsyncs or fans.