That detail matters because Intel Arc GPUs are unusually sensitive to Resizable BAR. Without it, the CPU cannot efficiently access the GPU’s full memory space, which can lead to severe performance drops. In this case, it made the difference between “SteamOS on Arc is broken” and “SteamOS on Arc is early, but actually running.” Even on Windows, leaving ReBAR off will severely impact Arc performance.
Commenters also pointed to another likely limitation: kernel support. Intel’s Arc drivers on Linux have improved considerably, but the newest performance work often depends on recent kernel and Mesa versions. If SteamOS’ Main channel is still behind the very latest Linux graphics stack, Arc performance may remain below what the same card can do under Windows or faster-moving Linux distributions.
For now, this is more proof of concept than a consumer-ready feature. Valve has not turned SteamOS into a general desktop gaming OS with clean support for every GPU, and the install path shown here is still too awkward for normal users. But the result is interesting. SteamOS running on an Intel Arc B580 suggests Valve's hardware net is widening, whether intentionally for desktop GPUs or indirectly through work on Intel-powered handhelds.
That could matter for future SteamOS machines . AMD remains the obvious fit for Valve’s gaming hardware today, but Intel has been pushing harder on Linux graphics support, and low-profile Arc cards could become attractive for small living-room builds if the driver stack matures.
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Etiido Uko is a news contributor for Tom's Hardware covering the latest updates in big tech and the PC industry. He is a mechanical engineer and senior technical writer with over nine years of experience in documentation and reporting. He is deeply passionate about all things engineering and technology, and is an expert in gadgets, manufacturing, robotics, automotive, and aerospace. ","collapsible":{"enabled":true,"maxHeight":250,"readMoreText":"Read more","readLessText":"Read less"}}), "https://slice.vanilla.futurecdn.net/13-4-24/js/authorBio.js"); } else { console.error('%c FTE ','background: #9306F9; color: #ffffff','no lazy slice hydration function available'); } Etiido Uko Social Links Navigation News Contributor Etiido Uko is a news contributor for Tom's Hardware covering the latest updates in big tech and the PC industry. He is a mechanical engineer and senior technical writer with over nine years of experience in documentation and reporting. He is deeply passionate about all things engineering and technology, and is an expert in gadgets, manufacturing, robotics, automotive, and aerospace.
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- https://www.tomshardware.com/software/operating-systems/reddit-user-gets-valves-amd-first-gaming-os-running-on-intel-hardware-steamos-boots-on-intel-arc-b580-desktop-gpu-but-it-takes-a-radeon-card-installer-workaround-and-resizable-bar-fix#main
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