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Can someone explain how if the PS4 (without "pro") with its 2 GFLOPS is not able to run complex games at 1080p at 60Hz, while the the XBox One X, with just 6 GFLOPS, is marketted as able to render games at 60Hz in 4K? Note that 4K requires 4 times the fillrate of 1080p, and that the memory bandwidth increase is just about +50%, and the CPU performance increase has been small in comparison.

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Isn't a lot of the "4k" in consoles really just rendering at a lower resolution and upscaling?

Yes, a lot of games target 1800p with checkboard rendering and upscale to 2160p. The PS4 has native hardware acceleration for checkerboard rendering.[1] [2]

[1]: http://wccftech.com/blow-checkerboard-rendering-ps4pro-isnt-... [2]: https://en.wikipedia.org/wiki/Checkerboard_rendering

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