Valve's Proton Test Build For Steam Machine And Linux Gaming Adds FSR 4 For RDNA 3
Not only was the Steam Machine just launched on the Steam storefront, but a quiet Proton Experimental update has enabled AMD FSR 4.1 on AMD RDNA 3 and RDNA 3.5 GPUs.
Similar to previous community tweaks done with a leaked version of AMD FSR 4, this version of AMD FSR 4.1 uses the internal INT8 version rather than the FP8 version. The INT8 version works on more GPU architectures than FP8, but does incur a higher performance penalty.
Valve just added the version of AMD’s FSR4 that was announced last month and adds support to older GPUs rather than just RDNA4
This DLL file, added to Steam, and coming to Proton Experimental will likely allow Steam Machine/SteamOS users to “upgrade” FSR3 supported games to FSR4 pic.twitter.com/kNNhMDS34D— Brad Lynch (@SadlyItsBradley) June 22, 2026
Even so, INT8 FSR 4 is preferred by many users of older AMD GPUs thanks to its...
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