Last month, AMD accidentally made FSR 4 open-source by publishing the entire source code on GitHub, as part of its FidelitySDK. That pushed modders to quickly reverse-engineer how to run FSR 4 on previously incompatible hardware, but the hacks were limited to Linux. That changed just last week when u/AthleteDependent926 on Reddit figured out how to make it work on Windows — we saw a 12-20% decrease in potential performance with it, and today new findings on older RDNA GPUs corroborate our testing.
There are actually three aspects to this story: first, we have an RX 6800 XT that showed a noticeable uptick in visual fidelity at the cost of FPS; secondly, Computer Base tested a bunch of GPUs that saw similar declines in performance; lastly, a Reddit user also tried FSR 4 on their RX 6950 XT and praised its image quality while noting fewer frames achived compared to XeSS. The focal point of the story, though, is the large overhead FSR 4 brings with it, even if it offers a much better-looking image than its predecessor.
