This really depends upon the games feature set and what they're trying to do. Systems such as AI and phyics and such are much more CPU intensive, as opposed to tons of rendering passes and pushing poly's (which are more graphics card intensive). Simply put, it really depends upon the feature sets that the game is trying to focus on.
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Latuh fuh U,
Benson
benson@2015.com
"We don't introduce or cause bugs in the game, we merely find and bring to light the inadequacies within the code."
-regarding level designers