AMD FSR 4 Unofficially Enabled on Radeon RX 7000 GPUs
Better Visuals Come with Performance Trade-Offs on RDNA 3 Architecture
User Unlocks FSR 4 on Older GPU Series
A Reddit user has successfully enabled AMD FSR 4 upscaling on a Radeon RX 7900 XTX, part of the RDNA 3-based RX 7000 series, despite the feature being officially limited to newer RX 9000 “RDNA 4” GPUs.
- The implementation was achieved using Optiscaler, which allowed the injection of FSR 4 DLLs over FSR 3.1, while disabling frame generation.
- This technical workaround enabled higher image quality and in some cases, better FPS than native 4K, although performance still lags behind FSR 3.1.
Game Testing Shows Mixed Results
The user’s testing spanned Cyberpunk 2077, Oblivion Remastered, and Marvel’s Rivals, offering valuable comparisons between FSR 4 and FSR 3.1 at 4K.
- Cyberpunk 2077: FSR 4 averaged 56.28 FPS, compared to 85.06 FPS with FSR 3.1.
- However, FSR 4 delivered notably better image quality, enhancing visual fidelity.
- Oblivion Remastered: FSR 4 quality reduced artifacts present in FSR 3.1, but FPS dropped by 20–30%.
- Despite the hit, the visual upgrade was substantial, especially for an older remastered title.
- Marvel’s Rivals: FSR 3.1 achieved 74 FPS, while FSR 4 managed just 41 FPS.
- While image quality improved slightly, the performance cost was significant, making it less viable for fast-paced eSports gameplay.
Upscaling vs Native Rendering Trade-offs
Compared to native 4K rendering, FSR 4 in Quality mode offered higher FPS and enhanced visuals, proving effective in graphics-intensive titles.
- However, its impact at lower resolutions like 1080p was far less impressive, as RDNA 3 hardware struggles to fully leverage FSR 4’s potential due to AI limitations.
- The user emphasized that while frame generation can still be added, the performance drop from enabling FSR 4 may outweigh the benefits in many use cases.
Conclusion: A Promising but Limited Hack
Enabling FSR 4 on RDNA 3 GPUs shows that the feature is technically possible outside its official hardware scope, but comes with compromises.
- Image quality is consistently improved, but the performance degradation is a major caveat.
- This experiment could prompt further community exploration, but for now, FSR 4 remains best-suited for RDNA 4 cards built to support its AI demands.
