AMD FSR 4 on RDNA 3? Early tests suggest it’s not only possible, but promising
Conventional wisdom says AMD’s new FSR 4 upscaler is a RDNA 4-only feature, thanks to its reliance on FP8 AI hardware. Officially, that’s still true. Unofficially, community workarounds have shown RDNA 3 cards can run FSR 4 on Linux via Mesa, which emulates FP8 using FP16. That emulation adds some overhead, but it also opens the door to surprisingly solid results.
One user put a Radeon RX 7800 XT through its paces in Clair Obscur at 1440p, comparing FSR 4 to FSR 3.1 and XeSS using the Ultra Quality preset through OptiScaler (an upscaler swapper that now supports FSR 4). Native rendering averaged around 95 FPS. Switching to FSR 4 nudged performance a bit above 100 FPS. FSR 3.1 and XeSS posted higher numbers in the same scene, landing around 120–130 FPS—expected, given the FP8-by-way-of-FP16 emulation cost on RDNA 3.
Performance isn’t the whole story, though. Image quality is where FSR 4 starts to pull ahead. According to the tester, FSR 4’s Quality and Balanced modes delivered better visual stability and clarity than FSR 3.1’s Ultra Quality setting. That makes FSR 4 an intriguing option for RDNA 3 owners who value image quality and consistency, even if raw frame rates trail XeSS and FSR 3.1 for now.
Key takeaways
– Official support: FSR 4 is officially for RDNA 4 GPUs due to FP8 AI hardware requirements.
– Unofficial path on RDNA 3: On Linux, Mesa can emulate FP8 with FP16, allowing FSR 4 to run on cards like the RX 7800 XT.
– Performance snapshot at 1440p (Clair Obscur): Native ~95 FPS; FSR 4 just over 100 FPS; FSR 3.1 and XeSS ~120–130 FPS.
– Image quality: FSR 4 Quality and Balanced presets look and feel more stable than FSR 3.1 Ultra Quality in this test.
– Reality check: Results are from a single game and setup; broader testing is needed before calling it a universal win for RDNA 3.
What this means for RDNA 3 owners
If you’re comfortable tinkering on Linux and your game supports upscaler swapping via tools like OptiScaler, FSR 4 is worth a try on RDNA 3—especially if you prefer better visuals over maximum FPS. Just keep expectations realistic: performance will likely sit between native and older upscalers due to FP8 emulation overhead, and stability will vary by title, drivers, and tooling.
The bottom line
FSR 4 isn’t officially aimed at RDNA 3, but early community experiments show it can run and even outshine previous-gen upscalers in image quality. With more games, driver refinements, and tooling updates, RDNA 3 users could see further gains—though the best performance will remain on RDNA 4 where FP8 hardware is native.
