Btw if you guys are gonna do the 'double-scaling' conversation you could use a bit more research into the topic.That's the main topic but be sure to watch the end of the video... ;)
For one there was conflating different things - when CB or other methods do temporal upsample, that's mostly adding sample data, not introducing blur like an upscale would, so calling that a 'double upscale' is factually wrong, at least for purposes of image clarity of the downsample. As RDR appears to literally render at half the 2160p and then stretch+fill the gaps, their approach is more scaling than not, but trying to lump everything under that umbrella is disingenuous at best.
And for two - for games that do nothing fancy and just render a lower resolution - they will output at one of the 'system supported' resolutions. See the leaked docs for reference (https://cdn.wccftech.com/wp-content/uploads/2016/07/neo_leak_4.jpg). You're not going to get those games upscale to 4k willy nilly unless there's some specific quality reasons for it(and in those cases those would probably outweigh scaling artifacts anyway), which would be quite rare for 1440p titles especially.
Which is not to say you don't get double-scaling at all - you will absolutely have situations when game is eg. dynamic res, so it upscales to nearest supported output res, and then there's a second scale to 1080p OR 4k (and that gives you double scale in both scenarios).
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