Adding an aftermarket CPU cooler to your gaming system will undoubtedly tighten thermal differentials to a more predictable range, and while semiconductors do "like" heat to a limited degree, CPUs have trouble operating under intense, fluctuating thermal load. Aftermarket CPU coolers, much like RAM, are a commodity in the mainstream market; they're not necessary to operate at stock frequencies, but are nice to have for decreased noise pollution and decreased room temperatures (I'm only sort of joking - my system easily increases room temps by a degree or two).
For lightweight overclocking, of course, the story is different -- these coolers are necessary to protect the chip and increase core stability when under load. There's a lot of engineering that goes into a quality CPU cooler and, as with any quality engineering, you won't find the best possible designs for entry-level coolers. There are elements to prioritize, though, and we can uncover what differences make the largest impact by benchmarking a wider array of units.
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