I tested DLSS 4.5 against FSR Redstone, and I don't believe anyone who says they can tell them apart

A hands-on comparison of Nvidia's DLSS 4.5 and AMD's FSR Redstone (FSR 4) upscaling technologies across multiple games including Battlefield 6, GTA V Enhanced Edition, and Cyberpunk 2077. In motion, the two upscalers are virtually indistinguishable in image quality. Minor differences appear in static scenes, mainly in foliage rendering. Performance gains are comparable between the two. The conclusion is that AMD has reached near-parity with Nvidia in pure upscaling quality, though DLSS still leads in frame generation, ecosystem adoption, and ray regeneration.