Intel Arc GPUs gain up to 29% FPS on SteamOS as modified driver unlocks XMX cores for XeSS acceleration

Modified Driver Activates Dormant AI Cores on Linux

Intel Arc GPUs running on SteamOS have been operating with a critical limitation since the platform added support for Intel graphics cards. The AI-powered XMX engines designed for upscaling technology and frame generation have remained inactive, forcing XeSS to run in DP4a mode on shader cores instead. This workaround not only reduced performance but also compromised visual quality while stealing GPU resources from rendering tasks1

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Source: Geeky Gadgets

An open-source project called xess-xmx-linux, developed by GitHub user HHHHanasak1, now addresses this gap by enabling XMX cores for XeSS acceleration on Linux gaming platforms. The modified driver unlocks both the native XMX-accelerated version of XeSS and XeSS Frame Generation, which is exclusive to the XMX implementation. YouTuber ETA Prime demonstrated the driver's capabilities across multiple AAA titles, revealing substantial performance improvements that range from 11% to 29% depending on the game1

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Cyberpunk 2077 Sees 29% FPS Gain with XMX Acceleration

Testing on the Intel Arc B570, which features 10 GB of VRAM and dedicated AI cores, revealed dramatic performance improvements in Cyberpunk 2077. At 1440p Ultra settings with XeSS set to Quality mode, the GPU initially averaged around 55-58 FPS using the DP4a version of XeSS. After installing the modified driver and activating XMX core support, performance leaped to 75 FPS average, representing a 28.8% to 29% increase1

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The driver also enabled XeSS frame generation, a feature previously unavailable on SteamOS. With frame generation active in Cyberpunk 2077, frame rates exceeded 110 FPS by generating additional frames between rendered ones. This capability effectively doubles performance in supported titles, though the game lacks native multi-frame generation support2

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AI-Accelerated Gaming Delivers Consistent Performance Improvements

Beyond Cyberpunk 2077, the modified driver demonstrated consistent FPS gain across multiple titles. Spider-Man 2 at 1440p high settings with XeSS quality mode saw frame rates climb from 61 FPS to 77 FPS, a 26% improvement. The Witcher 3 at 1440p Ultra with XeSS quality increased from 66 FPS to 81 FPS, marking a 23% boost. Forza Horizon 6 at 1440p Ultra settings jumped from 73 FPS to 86 FPS, an 18% gain1

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Intriguingly, Red Dead Redemption 2 showed an 11% performance improvement at native resolution with XeSS disabled entirely, climbing from 72 FPS to 80 FPS. This suggests the modified driver includes additional performance optimizations beyond XMX core activation that are not present in the default SteamOS driver1

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Installation Process Requires Terminal Commands

The installation process for the xess-xmx-linux driver involves several steps in SteamOS desktop mode. Users must download the latest release from GitHub, extract the files, and execute the install.sh command in a Terminal window. A system reboot is required to apply the changes. Before launching games, users need to add specific console commands like "XESS=latest" in the game's launch options to activate the driver. The driver supports both SteamOS and Bazzite on systems equipped with Intel Arc GPUs1

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Visual Quality Improvements Beyond Frame Rates

The modified driver delivers more than just higher frame rates. By offloading XeSS processing to dedicated XMX cores instead of shader cores, the driver frees GPU resources for rendering tasks, resulting in sharper visuals and improved image fidelity. The DP4a mode used without XMX acceleration impacts both performance and visual quality, making the native XMX implementation significantly superior for AI-accelerated gaming experiences2

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Source: TweakTown

The benefits extend beyond high-end cards like the Arc B570. Performance improvements have been observed on integrated GPUs like the B390 and lower-tier models, making the driver valuable for a broader range of Linux gaming setups. As the open-source project continues development, further optimizations could unlock even greater performance gains, particularly as Intel Arc GPU adoption grows on SteamOS platforms2

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