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Originally Posted by chemgear
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I figured I'd pull a couple quotes out of the anandtech column:
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Sony gave the PS4 50% more raw shader performance, plain and simple (768 SPs @ 800MHz vs. 1152 SPs & 800MHz). Unlike last generation, you don't need to be some sort of Jedi to extract the PS4's potential here. The Xbox One and PS4 architectures are quite similar, Sony just has more hardware under the hood. We’ll have to wait and see how this hardware delta gets exposed in games over time, but the gap is definitely there.
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Sony’s approach (especially when combined with a beefier GPU) is exactly what you’d build if you wanted to give game developers the fastest hardware. Microsoft’s approach on the other hand looks a little more broad.
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About how much the OS will use:
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The game is loaded in memory and is fully running. The game has full access to the reserved system resources, which are six CPU cores, 90 percent of GPU processing power, and 5 GB of memory. The game is rendering full-screen and the user can interact with it.
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So basically the OS needs 2 of the 8 CPU cores, 3 GB of RAM and 10% of the video card at minimum while a game is running. So not only are you looking at arguably 50% more powerful hardware in the PS4, but you're also talking about an OS that will take diminish a significant amount of the available power for games.
Comparatively the PS4 contains an additional 9th low power ARM processor to handle background tasks to minimize use of main system resources.