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According to AMD developer Timothy Lottes, a 7.4 TFLOP GPU would be required to run the average PS4 title at 4K 30fps. Interestingly, both the Xbox One X and PS4 Pro fall below this spec, which offer 6 TFLOPS and 4.2 TFLOPS of power respectively. Xbox fans are quick to mention that their console offers numerous native 4K 30fps titles, such as Forza Horizon 4 and Gears of War 4.
Lottes did, however, mention that that brief description is an oversimplification of a very complicated and layered process. That complication, of course, comes in form of stuff like supersampling, checkerboarding, and temporal reconstruction, which are means that developers in some cases use to have less than 4K pixels on the screen in terms of pixel count in their games, and then fill in those gaps through those techniques.
Lottes did, however, mention that that brief description is an oversimplification of a very complicated and layered process. That complication, of course, comes in form of stuff like supersampling, checkerboarding, and temporal reconstruction, which are means that developers in some cases use to have less than 4K pixels on the screen in terms of pixel count in their games, and then fill in those gaps through those techniques.