No idea, but I'm assuming someone simply released a speedhack or it was very poor programming updating the game logics without any sort of delay, assuming the CPU would be busy enough to delay it with at least 100 milliseconds.
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I don't need that processor for GunZ + Microsoft Word xD
Then I'm assuming the latter one, they were updating game logics (position updating, key processing, etc) endlessly, assuming that it'd take the CPU at least 50 milliseconds or so to process all those commands. With newer CPU's, it only took 5 milliseconds and as there was no delay, it updated 10 times more than the older CPU's, giving you the speedhack feeling. (Updating your position 10000 times every second instead of 100 times, meaning you'll be 100x faster)
buy a car and get bitches .
When a game has bad coding with fuctions that repeat over and over the cpu could be a problem. an example of a game wich does this is Minecraft. Minecraft eats away at your RAM and cpu power the longer you play it. that is also way it crashes sometimes.