>> I haven't played on the xbox360 very often (I don't own one) but my
>> impression is games on the PS3 use motion-blur and depth-of-field
>> approximation effects more.  Maybe the devs are just trying to find ways
>> to use up the spare CPU cores
>
>    Those effects are not dependent on the CPU.

The CPU is routinely used for graphics effects in the PS3, here's the 
first reference I could find via google:

"We're doing all the post-processing effects on the Synergistic 
Processing Units." Screen Space Ambient Occlusion for example, was done 
completely on the SPUs"

http://en.wikipedia.org/wiki/Uncharted_2:_Among_Thieves#Graphics_and_technology

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