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.