@ellos: Games will need patches to add new Pro specific features (better textures, lighting, higher resolutions, higher framerate caps, whatever).
But base PS4 games, while running identical code on the Pro, could/should in theory hold more stable without a patch. That was my point. Because the bone stock PS4 code for game X might enforce a framerate cap (say, 30fps) in order to help smooth out gameplay on the PS4. But the framedrops - the cases where it falls to 20fps - are a failure of the hardware to hit the frame cap. This is something that Sony cannot enforce on more powerful hardware - in fact they'd need to come up with some wacky patch in order to try to force it to stumble the same amount! So the game will have the same frame cap on the two systems, but the Pro should naturally do a better job meeting that frame cap. Think of it like you have a PC running a Radeon 7870. You set your game at a 30fps frame cap and a certain detail level - one that is high enough that your PC can't always hold at the 30. Now you swap in an RX470. You don't touch anything - same settings, same frame cap. It will look the same and still won't exceed 30fps, but you can bet that places in the game where that cranky 7870 couldn't keep up will do better at holding to 30fps.
Taking that logic a step further: in cases like BF1, the bone stock PS4 game dynamically changes resolution to try to hold a framerate - I'm going out on a limb here and suggesting that if a system (the Pro) has less difficulty holding a framerate target, then the code will less frequently need to down-scale the resolution over the course of your time with the game.
Some have pointed out that in some cases the frame drops are due to the CPU and not the GPU, however - in those cases, the Pro may only do marginally better. Its overclock is actually substantial over the PS4 - over 8 cores, that GHz boost is meaningful. Nevertheless, it's still that sad little Jaguar at the end of the day. So how much of a cure-all the Pro will be for frame drops on base PS4 games will vary depending on the source of the drop.
I'd love to see technical analysis of how this plays out in a wide swath of unpatched games, but I doubt even DigitalFoundry will bother. I think everyone's attention will be on the "upgraded" games and how they look and perform.
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