Sorry, I guess in the context I'm using it, they call it "AI Super Res." DLSS is a related application of the engine for the purpose of antialiasing.
But essentially it can take a 2K image and turn it into a 4K image convincingly enough that you're unlikely to be able to tell the difference in most situations.
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And obviously that's blown way up from the sorts of images you'd normally be looking about. When you're talking about the pixel size of a 1080p image on a monitor (or even a TV if you're sitting a few feet away) it seems pretty squarely "good enough," and opens up a ton of overhead for advanced rendering like ray tracing.
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