In fact, in some cases the box cooler is actually more effective than a lot of after-market coolers (mainly the cheap ones, though). The Opterons and X2's from AMD, for instance, come with very good heat-pipe coolers. The P4 box coolers are quite effective as well.
I've in reviews and they are using the stock heat sink/fan cooler and overclocked the cpu to 10%. So yes it is an adaquate cooler for normal or mild overclocking on the cpu.Make sure you have a good thermal paste and don't use that crappy thermal grease that comes with the stock cpu cooler.
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