AMD is working on a version of FSR 4 for older Radeon graphics cards, and today we are testing a work-in-progress build to see how it’s shaping up. Is this version as good as FSR 4 in terms of image quality? How does it perform on RDNA 3 and RDNA 2 GPUs? And, on balance, is it going to be a viable option for upscaling if AMD releases it officially? We are going to answer all of those questions today.
As we know, FSR 4 is only officially supported on the latest RDNA 4 graphics cards, such as the Radeon RX 9070 XT. This is because FSR 4 uses the FP8 data format to accelerate the AI upscaling algorithm, which is only supported in AMD’s RDNA 4 architecture.
However, AMD has been developing a version of FSR 4 that uses the INT8 format instead, which is more broadly supported. AMD introduced INT8 support with the RDNA 2 architecture, so theoretically, the INT8 version of FSR 4 could work on GPUs as old as the RX 6000 series. […]
Video version: YouTube
All in all it seems the INT8 version of FSR 4 is a pretty solid option, that does add value to older AMD GPUs. I am assuming the final version will show some improvement relative to these WIP tests.
Mid-range RDNA2 GPUs are going to struggle, but that’s to be expected.