4K Ultra HD is just the marketing moniker which Xbox uses. Ask them again does Far Cry 6 run at 2160p on PS5 and I'm sure the answer would be yes. I'll eat a teacake if not.
I came here to say this. I will also eat a teacake if this isn't the case. Both versions with output frames at 2160p res because thats the output of the console, it remains to be seen if they use reconstruction or other methods to get to 2160p. So this tells us literally nothing, the PS5 could do native 2160p while the XSX could reconstruct from 1440p for all we know, its extremely unlikely but just trying to make a point. Its more probable that both output at native 2160p but are locked to 30 since I doubt they will bother to optimise their engine to do 60 on next-gen consoles, they'd maybe offer an much lower res (reconstructed/upscaled to 2160p) at 60, but I bet even then it won't hold 60.
DO NOT hold your breath for 60 fps ubisoft crossgen games on PS5/XSX, they will focus on keeping the framerate at 30 and add in more tech like RT, while keeping it as close to 2160p as they can. Only way it will be 60 on next-gen is if its running at 1080p-1440p internally (always reconstructed to 2160p mind), but I doubt they'd do that even with DLSS 2.0 style technology because they don't care about 60 fps, they care about image quality.
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I think its been superseded by other similar things now, its all just a load of shite so they can put sticker on console/TV/etc boxes. Its like Samsung's HDR 1000/2000/XXXX ratings, its a test they use that is just straight up biased af. Done my VDE I think, which do good work but the test they use is out of date to make their TVs sound good on paper. LG sued them because of this behavior in 2016 because they kept trying to slag off OLED with borderline lies.
Its why an "HDR 2000" branded Samsung TV has a peak brightness of like 800 nits. They don't use the word "nits" so they can just talk out of their asses lol.