AlphaLyrae
Posts: 14 +9
PSSSR ... Sony written ML upscaler working on PS. Which is modified RDNA2.
PSSR is a PS5 Pro only feature because this hardware is based on RDNA3/4, with firmware that forces shader ISA to gfx10 (RDNA1/2) for easy compatibility with base PS5. With 60 CUs and 3 shader engines, it's essentially a 7800XT without Infinity Cache or the updated render backends. ROPs are based on an older RDNA1 design that doesn't support VRS. Sony also doesn't use DirectX standard mesh shaders, rather they use AMD's primitive shaders for all geometry calls. RDNA4 features are limited to updated RT hardware, which also requires some developer coding to use the new instructions and hardware (PS5 Pro Enhanced patches).
Matrix cores are exposed only to PSSR API. A major FSR4-based PSSR 2.0 is due soon. It's supposed to launch sometime this quarter and should also be implemented in the biggest game of the year: GTA6, if it actually makes its November launch date.
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