It looks like Valve jumped the gun in releasing AMD’s FSR 4.1 files for RDNA 3 via experimental files for its Proton OS. It’s already publicly known that AMD plans to release an update in July for owners of Radeon RDNA 3-based graphics cards that will bring support for FSR 4.1 to older-generation hardware, but it is a bit of a surprise to see the files a month early. The leaked files, as posted on Reddit and reported on by VideoCardz, allowed Optiscaler to use FSR 4.1 running on an AMD Radeon RX 7800 XT.
Now, according to more recent reports, the files that were housed in the Proton depot are no longer available, but that didn’t stop some from accessing them before being taken down. It’s been said that they were able to be used in Windows as well, and evidently run faster, providing more FPS than previous FSR versions. Another Reddit user stated they tested it in Stellar Blade and claims a roughly 8% improvement at 1440p. Below is another Optiscaler snapshot, but it is reportedly taken from Windows. Users are sharing Optiscaler screenshots, as getting FSR 4.1 to work was as easy for some as dropping the DLL files into its folder.
Now, as exciting as this is for owners of older Radeon RDNA 3-based graphics cards, there are a couple of big takeaways here. First, is that it’s a safe assumption that AMD has progressed far enough along with this update that a final version of its files has already been provided to certain partners and developers. Next is that FSR 4.1 INT8 is capable of running on the older hardware, and AMD seems to have found a way for it to be efficiently processed, just as done with FSR 4 INT8. Those who missed snagging these files shouldn’t fret too much, as AMD is expected to provide the official update within a matter of weeks.
Discussion (5 replies)
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They had better not abandon the mobile/handheld gamers, RDNA 3.5 must also get FSR 4.1.
it is but a slightly inferior implementation
That is iffy
[URL unfurl="true"]https://www.digitalfoundry.net/news/2026/06/report-fsr-4-1-currently-doubtful-for-rdna-3-5-processors[/URL]
This is AMD's time to shine, and show their user base they care, or not. Ball is in their court for this.
AMD Rolls Out FSR 4.1 For RX 7000 GPUs, Builds a Lightweight ML Model for RDNA 3.5 and RDNA 3 iGPUs
Hassan Mujtaba
Jun 22, 2026 at 10:30am EDT
AMD has officially launched FSR 4.1 for Radeon RX 7000 GPUs while confirming support for RDNA 3.5 & RDNA 3 GPUs coming soon.
The support is on its way, but AMD hasn't disclosed a final release date yet for iGPUs.
FSR 4.1 Upscaling Coming Soon To RDNA 3.5 and RDNA 3 iGPUs
...the icing on the cake comes from the fact that AMD is also confirming support for RDNA 3 and RDNA 3.5 APUs. For these iGPUs, AMD will be developing a new lightweight machine learning model that brings FSR 4.1 upscaling to even more devices, say Laptops, Mini PCs, Handhelds, and much more.
[URL unfurl="true"]https://wccftech.com/amd-rolls-out-fsr-4-1-rx-7000-gpus-builds-lightweight-ml-model-rdna-3-5-rdna-3-igpus/[/URL]