This article clarifies why the Xbox 360 has a better framerate and better lighting then the PS3 conterparts on multiplatform games.
"By using unified shader architecture, DirectX 10 allows developers to devote graphic card resources to whatever they want, depending on what the needs of their game are. This kind of efficiency will help make motion blur look better in PC racing games, and lighting look better in shooters."
"Having fully programmable shader architecture is the single most important advancement," says McGrath. "It has opened up a world of possibilities that just weren't possible in older hardware. Game visuals are now advancing at a rate that exceeds that of film visuals, so the gap between them is getting smaller and smaller."
I know the 360 doesn't qualify as fully DX10 compatible but it has more features than DX10 and the PS3(way more than the PS3 fully programmable shaders etc..), and explains that effects and lighting are much better on unified architecture GPUs. It doesn't matter how powerful your cpu is when your GPU is inferior like the RSX.
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