Valve appears to be moving closer to bringing AMD’s FSR 4 upscaling tech to the Steam Machine, with files connected to FSR 4.1 appearing in a Proton Experimental build shortly before the system’s first units begin shipping.
The discovery was made by YouTuber and XR analyst Brad Lynch, who spotted a new AMD FidelityFX library inside files associated with Valve’s experimental Proton branch. Proton is the compatibility layer SteamOS uses to run Windows games on Linux-based devices such as the Steam Deck and Steam Machine.
The addition suggests Valve is actively testing a way to load AMD’s newer FSR 4.1 tech. while running compatible Windows games through SteamOS.
Valve Confirms It Is Working With AMD
Valve has since confirmed that it is working directly with AMD to bring FSR 4 support to the Steam Machine.
The company has not provided a firm release date, only saying that support is coming soon. That leaves it unclear whether FSR 4 will be available when the first Steam Machine orders begin shipping on June 29 or whether it will arrive through a later SteamOS update.
The Proton implementation could potentially allow supported games using FSR 3.1 to load the newer FSR 4.1 upscaler without requiring developers to release individual updates. However, the feature remains part of an experimental build, and Valve has not explained how broadly the automatic upgrade system will work.
FSR 4 Could Address a Major Steam Machine Weakness
FSR 4 is particularly important for the Steam Machine because the compact gaming PC relies heavily on upscaling to deliver higher resolutions from its semi-custom AMD RDNA 3 graphics hardware.
Earlier versions of FSR can significantly improve frame rates, but they have often struggled with image stability, ghosting and fine details while objects are moving. AMD’s machine-learning-based FSR 4 technology is designed to produce sharper images, preserve particle effects more accurately and reduce visible artefacts.
Valve says the technology should provide a significant improvement in graphical upscaling quality on the Steam Machine. It may not necessarily deliver a dramatic performance increase, particularly when running on older RDNA 3 hardware, but games should look cleaner when using lower internal rendering resolutions.
That could prove valuable for demanding games where the Steam Machine needs aggressive upscaling to maintain playable frame rates at 1440p or 4K output resolutions.
AMD Has Expanded FSR 4.1 to RDNA 3 GPUs
FSR 4 was originally associated with AMD’s newer RDNA 4-based Radeon RX 9000 graphics cards. AMD has now officially expanded FSR 4.1 support to desktop Radeon RX 7000-series GPUs through its Adrenalin 26.6.2 driver.
The Steam Machine uses custom RDNA 3 graphics hardware rather than a standard desktop Radeon card, so it will require its own SteamOS and driver implementation. AMD is also developing lighter machine-learning models intended to bring FSR 4.1 to additional RDNA-based devices.
The appearance of the required files in Proton Experimental indicates that work on the Steam Machine version is already underway. Whether it will be polished enough for launch remains uncertain, but the upgrade could become one of the system’s most important post-release improvements.
FAQ
Will the Steam Machine support AMD FSR 4?
Yes. Valve has confirmed that it is working with AMD to bring FSR 4 support to the Steam Machine, although an exact release date has not been announced.
Will FSR 4 be available when the Steam Machine launches?
That has not been confirmed. Valve says support is coming soon, while the current implementation has only appeared in Proton Experimental.
Will Steam Deck games also receive FSR 4?
Valve has not announced FSR 4 support for the Steam Deck. The handheld uses older RDNA 2 graphics hardware, and AMD is not expected to extend official RDNA 2 support until 2027.
The copy above is clean and contains no embedded links or reference markers. Valve’s shipping announcement, AMD’s FSR 4.1 driver notes, Valve’s confirmation and the Proton discovery were separately verified.
