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So here is a genuinely fascinating potential artefact from AI upscaling: youtu.be/1NsfqJPmhYY
Check as the first scene reaches the door. Nearest filtered textures are being "anti-aliased" until they become large enough for DLSS to ignore them (99% sure I'm not imagining this difference looking back & forth for equivalent distances as the videos aren't perfectly in sync).
The DLSS is otherwise extremely impressive. Sharpening+AA is top notch baring a few shimmers (DLSS Quality probably fixes).

Worth remembering that DLSS Performance mode is reconstructing from a buffer of 1080p images, depth, & motion vectors. When compared with 4K native, nearest filtered textures should cause differences up close. But part of the sharpen + AA + tweak mipmap transitions of the reconstruction to compete with native res is using AI learning to mask that. It probably wasn't trained on many nearest filtered textures (or has any way to flip it to a model trained just for that).

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