AMD FSR 4 vs Nvidia DLSS 4 at 4K

A few weeks ago, we compared FSR 4 to DLSS 4 upscaling for the first time, doing so at 1440p and concluding that FSR 4 is a solid upscaling technology. It's a significant step up from FSR 3.1, often outperforming Nvidia's DLSS 3, although the newer DLSS 4 with its transformer AI model still takes the lead. But how does it stack up at 4K? That's what we'll be exploring today.

Examining upscaling at different output resolutions is crucial because upscaling quality can vary dramatically between 1080p, 1440p, and 4K. At higher resolutions, more data is fed into the upscaling algorithm, so output quality is generally better than at lower resolutions.

With FSR 3.1, for example, Quality mode upscaling was often usable at 4K but looked rough at 1080p. So, we're interested to see how FSR 4 performs under the most favorable conditions ...