While the PS4 Pro should be able to run some games natively at 4K, it seems that history will repeat itself as it will use dynamic resolution to balance frame rates.
http://www.tweaktown.com/news/54889/ps4-pros-native-4k-games-trigger-fps-drop/index.html
Not that I expected otherwise...
http://www.tweaktown.com/news/54889/ps4-pros-native-4k-games-trigger-fps-drop/index.html
Not that I expected otherwise...