Valve adds AMD FSR 4 to Proton Experimental for SteamOS “upgrade” options
Valve’s Proton Experimental compatibility layer now includes AMD FSR 4 DLLs – Is this for SteamOS FSR upgrades?
Valve has officially added custom AMD FSR 4 DLLs to its Proton compatibility layer, paving the way towards FSR 4 support on Steam Machine. This means that Valve’s upcoming console-like gaming PC could feature a form of AMD “FSR Upgrade”, allowing supported games to be upgraded to AMD’s newest upscaler. With update 3.8, SteamOS now officially supports Valve’s Steam Machine, suggesting a near-future product launch.
AMD plans to launch FSR 4.1 for RDNA 3 GPUs next month. Furthermore, the company is targeting quality parity with FSR 4.1 on RDNA 4 GPUs. Adding this support to Steam Machine would be a big deal for Valve. After all, AMD’s FSR 4 upscaler delivers better visuals than the upscalers available on PS5 (not PS5 Pro) and Xbox Series X/S.
Brad Lynch, a prominent reporter of Valve hardware news, has stated that Valve’s FSR 4 DLL is a tweaked version of AMD’s. This DLL likely supports the RDNA 3 GPU inside Valve’s Steam Machine. This suggests that there will not be an “FSR 4 Upgrade” feature for Valve’s RDNA 2-powered Steam Deck. Note that AMD plans to support FSR 4 on RX 6000 series (RDNA 2) GPUs in 2027.
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
If Valve’s Steam Machine launches with support for FSR 4, it would greatly benefit the system’s visuals. FSR 4 delivers much higher levels of image quality than FSR 3. These benefits will be huge for the Steam Machine’s relatively low-end RX 7600M-class graphics card.
FSR 4 support on Steam Machine is also a big deal for AMD. This support will encourage more PC game developers to support AMD’s FSR upscaler. It may even encourage some developers to upgrade their older games with FSR support to benefit Steam Machine users.
You can join the discussion on Valve’s planned support for FSR 4 on the OC3D Forums.
