At the beginning, the story seemed fairly straightforward. AMD launched its FSR 4 technology by officially reserving it for its RDNA 4 GPUs. Then, public libraries emerged, and a theory arose suggesting that FSR 4 could actually work with the Radeon RX 7000 and RX 6000 series, GPUs based on the RDNA 3 and RDNA 2 architectures.
This hypothesis gained credibility when the modding scene began to enable an INT8 variant of this technology on older cards. In reality, this situation could ultimately be quite different.
During a major interview with Digital Foundry, the architect of the PS5 Pro explained that AMD’s FSR “Redstone” and Sony’s new PSSR are based on the same basic model, with different implementations depending on the underlying hardware. FSR Upscaling relies on FP8, while PSSR uses INT8. Essentially, what many interpreted as a potential gateway to older Radeons may actually resemble a branch of work designed for the PlayStation ecosystem.
The FSR 4 situation is not the future of Radeon RX 6000
For weeks, the debate revolved around a PC-related question. Is AMD preparing a version of FSR 4 for its RDNA 2 and RDNA 3 GPUs? Mark Cerny’s remarks (architect of the PS5 Pro) do not confirm this and suggest another direction instead.
This famous INT8 version is not an indication of official extended support on PC, but rather a piece of the technological puzzle connecting AMD to Sony through the Amethyst project and the next evolution of PSSR. In his explanations, Mark Cerny indicates that in practice, the same model is used but operates on different datasets depending on the platform’s uses and constraints. He also adds that the visual goals are not the same between PC and consoles, especially because a PC player is closer to their screen than a console player to their TV screen. Consequently, the final rendering does not need to be identical to be consistent with the visual hardware.
In the end, we have two certain realities. Yes, the community managed to run an INT8 version of FSR 4 on RDNA 2 and RDNA 3 GPUs using tools like Optiscaler. Yes, the latest updates have indeed improved compatibility and reduced some issues like ghosting on RX 6000 with recent drivers. However, all this does not prove that AMD is preparing official mainstream support for these cards.
