AMD has recently officially launched the FSR 4.1 upgrade for graphics cards based on the RDNA 3 architecture. Earlier tests have indicated that, on Radeon RX 7000 series graphics cards, FSR 4.1 delivers significant performance enhancements over rendering at native resolution. However, the latest comparative test conducted by German technology media outlet ComputerBase has highlighted that, within the same RDNA 3 architecture environment, FSR 4.1 demonstrates a certain degree of performance regression when compared to its predecessor, FSR 3.1.
Specifically, at a 4K resolution, the RX 7900 XTX achieves a frame rate of 50.2 FPS in FSR 3.1 Performance mode. In contrast, when operating in FSR 4.1 Performance mode, it reaches only 45.3 FPS, marking a difference of roughly 10%. This observation has sparked considerable attention from the external community, raising questions about the trade-offs involved in the FSR 4.1 upgrade.
To ensure visual effects on the RDNA 3 architecture that are comparable to the original FP8 version, AMD has employed quantization training techniques to convert the FSR 4.1 model to INT8 precision. Nevertheless, the observed performance discrepancies still necessitate further optimization and clarification.