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JackHandy said:
SvennoJ said:

PD build it from the ground up to support native 8K, 120 fps, 10 bit rec.2020 up to 10K nits, from source textures all the way to the end result. It's made ready for ray tracing, yet since the ps4 doesn't have that it was using pre-rendered lighting, shadows and reflections instead.

The precise specs don't matter when building a new engine. Making sure you can support all the expected features (rec.2020, HDR, ray tracing) to their fullest extent is what makes it future proof. The SSD speed is a nice bonus, but likely won't be fully utilized to stream data beyond faster loading.
Now GTPlanet has revealed that Gran Turismo Sport was recently showcased at a Japanese consumer electronics show in Tokyo dubbed ‘InterBEE 2018.’ Sony was there to showcase its high-end Crystal LED displays, with a massive 440-inch screen displaying Gran Turismo Sport in native 8K resolution at a blistering 120fps.

I see. Pretty neat stuff. Thanks!

But I have a question. In the past (Pre-PS4 gen), developers use to say that a system's architecture dictated what they could or could no do. For instance, PS1 got more 3D games than Saturn due to the unique abilities of the machine. Same for Xbox 360, due to the difficulties of working with the Cell processor. So what's changed? How are these people able to develop for consoles without knowing the full specs? That's what I'm not understanding. Has the way these companies built their consoles changed so something like that is possible? 

I don't think they new the exact specs, but they prepared for 8k, native 4k.  Stuff like brightness nits, full color gamut, etc, they took into consideration the future and put it into the engine to allow it to be scalable and taken advantage of in future hardware and tv sets when available to consumers.  As for ray tracing , they probably expected it but not sure how important it was.  These are additions they can add to the game. They new the ps5 will be much powerful, and started working on tech like full day/night to make it into all maps cause of the boost in power, ssd,  along with atmospheric tech, which i'm not sure will make it to the ps4 version. Track and map detail will hugely benefit on the ps5.  Then audio is another major boost.

Gt7 on ps4 will look like gt sport, and that game will have all the gameplay content such as tuning and campaing mode, photo mode etc.. For those who play it on ps4 will be happy no doubt, considering gt sport was lacking along of features from previous games.  But on ps5 it will be a beast, and not to forget the load speeds due to the ssd.