Devs are setting games to run up-scaled from 1080p to 1800p for example....
The PS4 Pro cannot handle 1800p, let alone 4k. The Pro running games at 1800p is like having the original PS4 run the same game at 1080p - it can, but the performance is going to be mediocre at best.
PS4 has a GTX 750Ti/HD 7850 equivalent GPU - these are low-level cards by today's standards and are ideal for sub 1080p gaming. 720p, they'll handle anything you throw at it. 1080p? Sure, they can do it, but at lower settings and they won't hold a high, stable framerate for the most part.
PS4 Pro has a GTX 970/R9 290x or 390 equivalent GPU. These are ideal for 1080p gaming. They can tackle most games out there on high settings at 1080p without much of a problem. Once you go past 1080p, they start to struggle. They're not ideal for 1440p, let alone 1800p some devs are putting games at for the PS4 Pro. Asking the Pro to handle 1800p or 4K resolutions is the same as expecting the original PS4 to play games on 1080p without frame dips - just not going to happen.
Why anyone is surprised at the performance dips on the PS4 Pro is beyond me. Devs are being stupid. They need to maximize their games to run with much better/higher settings on 1080p. They could have great looking games on 1080p using what the PS4 Pro has to offer. They need to relax and back away from the idea the new PS4 or Xbox will handle games above 1080p without issues and should play VR games much better over the original X1 and PS4. Right now, all that's going to happen is people that buy the new systems are going to be mad the performance is crappy at resolutions above 1080p (or in the case of the Pro, games running at resolutions over 1080p and are being downsampled to 1080p, the games are taking hits in performance because the system cannot play games above 1080p very well with it's hardware).
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