You think you can get DLSS Ultra Performance with a 4K output to match or even surpass PS5 image quality at pixel counts that high? If so that's such a massive gulf to the point Switch 2 might be able to keep up in graphic settings for that particular game, with a single 30 frames per second mode. Black magic at its finest.
ultra performance, maybe not. but remember that the PS5 version of Doom Eternal specifically is dynamic 4K in the highest resolution mode. to get 1080p internal resolution you therefore need around 25% of the PS5's render power.
if we assume the Switch 2 in docked mode can get to 25% of the PS5's render power, we could in fact see a Doom Eternal port that looks better on Switch 2 than on PS5.
some additional comparisons I made.
(I upscaled all images to 4K using a bicubic scaler, to match the image resolution on all images)
1440p DLSS Performance Mode (720p internal resolution)
this still looks surprisingly ok in motion, although the image breakup will be obvious, especially on fine details like the grass you see in the image. however, it is still absolutely serviceable, and without an FPS lock I would have gotten 220+ fps here with raytracing, high settings (current gen consoles use Medium and high mix)
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1754p DLSS Performance Mode (877p internal resolution)
motion breakup in this one was basically on par with native TAA, maybe slightly worse, but not noticeably, especially if you'd enable motion blur (which I wouldn't, but it would absolutely hide the ghosting)
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and to showcase differences with ghosting, here are 2 images taken while strafing from right to left with some fine details in front of the camera.
motion artifacts would be to the left of the rubble in front and to the right of the gun as it disoccludes stuff behind it
4K TAA
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4K DLSS Performance Mode (1080p internal resolution)
that last image could be a preview of what a possible PS5 Pro patch could look like. I use higher settings across the board compared to PS5, and raytracing is enabled.
I get between 90 and 140 fps depending on the scene, on a GPU that should be anything between 30% and 40% slower than the PS5 Pro's GPU, while getting superior image quality to the Base PS5's raytracing mode, which is locked to 60fps.
I feel like Nintendo could totally get away with running games in handheld mode at resolutions of 720p and then use DLSS to 1080p.
at 720p internal resolution, DLSS will start to exhibit obvious ghosting in basically all games, and fizzling will also crop up. but on a handheld it is probably 1: less noticeable and 2: just more acceptable by the general public, as it is a handheld, and you don't expect pristine image quality from a tablet in your hands.
connected to a TV, the internal resolution should at least reach 900p for a clean 4K output, while 1080p internal increased to 4K with DLSS would be near perfect image quality, and 800p would still be on the edge, but acceptable for such a low power device I think.