Valve: "...For the 360 version of the game, we can probably say we are using around 93-94% of the console's power given our current optimization. With the PS3, we can't exactly say what power cap we reached, since no developer really knows where the boundary is for the PS3. We can tell you that in terms of the whole game together on the PS3, we are not even using the SPU's and it is purely built on the graphics card and Cell..."
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Interview pulled by request from Valve.