A user on Reddit has managed to enable AMD's FSR 4 upscaling on a Radeon RX 7000 "RDNA 3" GPU, leading to improved FPS & image quality.
User Enables AMD FSR 4 Upscaling On Older Radeon RX 7000 "RDNA 3" GPU, Leading To Better Image Quality & Higher FPS
User, Virtual-Cobbler-9930, on the Radeon subreddit, posted a long thread of his recent testing of FSR 4 running on a Radeon RX 7900 XTX GPU. This is interesting since AMD's FSR 4 is exclusive to the newer Radeon RX 9000 "RDNA 4" GPUs due to architectural changes on the AI/ML side. With these new tests, it looks like Radeon RX 7000 "RDNA 3" users may also be able to harness FSR 4 for higher visual fidelity and even higher FPS in a few cases.
The testing was conducted on three titles: Cyberpunk 2077, Oblivion Remastered & Marvel's Rivals. This was done on Linux and not Windows, but the user has shared some performance insights for the Windows version of this, too, which we will add to this post. To add FSR 4, Optiscaler was used to inject the DLLs over FSR 3.1 while frame generation was disabled.
Starting with the Cyberpunk 2077 tests at 4K, the user managed to obtain an average of 56.28 FPS with FSR 4 enabled versus 85.06 FPS with FSR 3.1. The quality preset was used in both cases, and it looks like FSR 4 was indeed working as the image produced was of higher quality than the FSR 3.1 implementation.
Compared to native 4K, FSR 4 at Quality can offer higher FPS. We have also seen that upscaling can lead to better image quality than native rendering, and FSR 4 is a very high-end upscaling method.
While frame-generation benchmarks were not included, the user does report that it can be enabled for even higher FPS, and going with a lower upscaling method will still yield better image quality vs FSR 3.1, so in his opinion, the performance loss is worth it.
In Oblivion Remastered, the FPS is higher with AMD's FSR 3.1 Quality mode, but the older upscale produces lots of artifacts, which are reduced greatly with the FSR 4 quality mode. The hit enabling FSR 4 is around 20-30%, but users can enable FSR balanced mode or frame generation for higher FPS.
And last, there is a comparison of FSR 4 Quality mode against FSR 3.1 Quality mode in Marvel's Rivals. Once again, the FPS takes a hit with FSR 4 only producing 41 FPS on average versus 74 FPS on average with FSR 3.1. The FSR 3.1 implementation here is better than the other two titles, but FSR 4 still improves some aspects of the game, but the overall FPS loss doesn't warrant the image quality improvement, since this is a faster eSports title.
Please note, that while FSR4 Quality preset do gain additional FPS at 4k, compared to plain native without upscalers (imgur), that gain could be almost nullified at lower resolutions like 1080p. Simply because it RDNA3 can't push higher fps with FSR4 due to architecture. Hope that make sense.
So overall, AMD's FSR 4 can be enabled on Radeon RX 7000 "RDNA 3" GPUs, but due to architectural limitations on the AI side, which is required for FSR 4, it looks like users will have to deal with FPS-loss to get better image quality.
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