In the original AMD FSR 4 reveal slide at CES 2025, we learned through some tucked-away text that the "AMD FSR 4 upgrade feature (is) only available on AMD Radeon RX 9070 Series Graphics for supported games with AMD FSR 3.1 already integrated", but exactly how this worked wasn't explained. Now a tip from reputable industry insider @Kepler_L2 on Twitter, indicates that the RDNA 4 driver for the AMD RX 9000 Series will simply be replacing the FSR 3.1 .dll application extensions with those for FSR 4, making for a seamless upgrade on the user's end, without requiring help from the developer.
Since AMD FSR 4 was also showcased at CES 2025 in Ratchet & Clank: Rift Apart without a patch being needed, this tracks with what we've previously seen of FSR 4.
