Tangentially related: Back in the day, the AMD Cool'n'Quiet feature had a funny effect in CS:Source where your player would move much faster than normal. This resulted in bans because of the obvious advantage, which was mistaken for a speed hack.
Something similar happened when anyone try to play un-patch Unreal Tournament (1999 game) on modern cpus. The dynamic cpu speed confuses the game engine, that results on the game slowing of becoming comically faster.