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I don't know why this guy specifically underclocked his proccessor, but in general here are a few reasons:
1) If it's an Athalon, running at full clock speed can occassionaly cuase glitching in the pipelines due to bad architecture, so underclocking can make them more stable.
2) Uses less power.
3) There is no need to run at full speed on high end processors unless you have a lot of very fast memory since it will bottle neck through the memory. (By fast and a lot, I mean RAMBUS and 512Meg plus)
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