The new benchmarks reveal that even though it's possible to run FSR 4 on RDNA 2 and RDNA 3 GPUs, the performance impacts will be noticeable in comparison to FSR 3.1.
RX 7800 XT and RX 6800 XT See 9-13% Performance Reduction with FSR 4 INT8 in Quality Mode Compared to FSR 3.1 Quality
As you might be aware, AMD's latest upscaler, FSR 4, is officially compatible only with the RDNA 4 aka Radeon RX 9000 GPUs, since these GPUs support FP8 format, while the previous gen RDNA 3 and RDNA 2 GPUs don't. With AMD's leaked INT8 model files, users are able to get unofficial INT8 version of FSR 4 working on both these GPU families, and we have seen users claiming similar visual quality on these GPUs, but at the cost of smoother gameplay.
Recently, Computer Base tested the INT8 version of FSR 4 to find out exactly how much performance impact both RDNA 3 and RDNA 2 GPUs have to bear in order to offer better visuals compared to FSR 3.1 When it comes to visual quality, Computer Base says that the difference between the FP8 and INT8 FSR 4 can be noticeable in some areas, but in some it won't. This varies from game to game and scene to scene, but overall the official FP8 FSR 4 version delivers superior visual quality, which should be no surprise.
However, the FSR 4 INT8 version also delivers much better visuals compared to FSR 3.1 as tested on Radeon RX 7800 XT and the RX 6800 XT. Both GPUs were tested and compared against AMD's Radeon RX 9060 XT, which is a bit slower in raw power. As you can see in the charts, the RX 9060 XT doesn't have to lose a lot of performance when going from FSR 3.1 to FSR 4, and the difference is hardly 3% on Quality mode at 1440p resolution.
However, both the RDNA 3 and RDNA 2 GPUs saw a performance difference of roughly dual-digit in Average FPS. The Radeon RX 7800 XT saw 9% slower performance with FSR 4 INT8 compared to FSR 3.1. The RX 6800 XT saw a similar performance regression (roughly 10%), which is much higher than what we see on the RX 9000 series. On the FSR 4 Performance preset, the RX 7800 XT and RX 6800 XT were able to outperform FSR 3.1 by 5%, but when compared to FSR 3.1 Performance, the difference was roughly 12-13%.
This goes inline with previous report where the RX 6800 XT lost around 10-20% performance with FSR 4 INT8, but did had superior visual quality. Nonetheless, AMD hasn't yet confirmed whether it will release an official FSR 4 INT8 version for RDNA 3 and RDNA 2 GPUs, but a lot of gamers are awaiting FSR 4 support on these GPUs.
News Source: Computer Base
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