Here is what the evidence supports, where the punditry runs ahead of it, and what a Windows gamer should check before wiping a drive.
What actually changed
Valve's Steam Machine FAQ says that with SteamOS 3.8 you can run the same code and operating system as the Steam Machine on your own PC, "using whatever PC parts you want", and that "right now, only AMD GPUs are supported." PC Gamer reported that this note was tucked at the end of the FAQ. It arrived alongside the Steam Machine pricing reveal and order reservations.
Valve has been widening SteamOS support in steps:
- SteamOS 3.7 (May 2025) was the first release to add official support for PC hardware other than Valve's own Steam Deck, according to Ars Technica.
- SteamOS 3.8 extended that to generic AMD desktops, as above.
- SteamOS 3.9 is in preview and has not been released as a stable build.
Official versus "it boots"
The headline overstates the support. Valve's own distinction is narrower than "any PC."
- Only the Steam Deck, Steam Machine and Lenovo Legion Go S carry the official "Powered by SteamOS" status. The ROG Ally X, the original Legion Go and other AMD handhelds are listed as beta support.
- Custom installs are still noted as beta on Valve's support page.
- Valve's current support material also lists the Steam Frame as a "Powered by SteamOS" device. I couldn't confirm that from the page text itself, only from the research notes.
A "Steam Machine" built from your own parts is therefore a useful analogy, not a Valve product designation. Expect the usual hardware-variety friction. Dev.ua reported that custom PCs can run into incompatible Ethernet chips, Wi-Fi modules or sound cards. It also noted that Secure Boot must be disabled in the BIOS to install. That last point matters to Windows users. Disabling it is a security trade-off, and some anti-cheat systems and Windows 11 configurations expect it to be on.
The GPU question: AMD yes, Nvidia not yet
eTeknix says Radeon cards work "perfectly" out of the box. Valve only promises that AMD GPUs are the supported ones. The Six Axis noted that the best results may come from RX 6000 cards, which share RDNA 2 with the Deck, and RX 7000 cards, which share RDNA 3 with the Machine.
The Nvidia picture is less settled than either camp admits:
- Dev.ua reported that Valve's Pierre-Loup Griffais had previously said Valve is working with Nvidia engineers on compatibility in future updates.
- A third-party guide from tech-insider.org says testing in 2026 found SteamOS failing to set up working drivers on a meaningful share of RTX 40-series cards. I'd treat that as indicative, not authoritative.
Valve has made no promise of Nvidia support. If you run GeForce hardware, treat SteamOS as an experiment, not a migration plan.
What the SteamOS 3.9 preview adds
Valve's Steam Deck news page lists the 3.9 changes. The preview is opt-in through Settings > System > System Update Channel and is still being tested.
- An updated Arch Linux base.
- Desktop Mode moves from Plasma 6.4.3 to Plasma 6.7.3.
- A bootloader update to improve compatibility with certain motherboards. That's the item that matters most to desktop builders.
- The Desktop Mode lock screen can now be enabled explicitly, though it stays off by default.
- A Linux kernel rebase onto 7.2, plus preliminary hibernation support that isn't yet exposed in the Game Mode interface.
- A known issue: new installs default to the wpa_supplicant Wi-Fi backend, while existing installs keep iwd unless it is changed manually in Developer Settings.
Preview builds have also had regressions. The 3.9.2 beta notes list fixes for regressions from earlier 3.9 previews, including slow boot, a missing boot logo and broken virtual keyboard input for some languages. The branch is moving fast. That is encouraging, but it is not a stable release.
The current stable release is 3.8.28, released September 24, 2026. Its notes include:
- A major Mesa graphics-driver update with ray-tracing and other performance improvements.
- Better VRAM management where video memory is limited.
- A fix for black screens in some launchers, including Zenless Zone Zero and Final Fantasy XIV Online.
- A fix for degraded game performance after sleep/resume on systems with AMD discrete GPUs.
- Several fixes for non-Valve devices.
This is meaningful maintenance. It is also not a benchmark against Windows.
Claims that need a grain of salt
The eTeknix piece is an opinion feature. Several of its claims are not backed by anything in Valve's documentation.
- Performance: It says independent testing shows SteamOS matching or beating Windows 11 in AAA games. It cites no tests, and Valve's release notes include no Windows comparisons. Results on Linux and Windows vary by game, driver and hardware.
- Shader stutter: The claim that pre-cached shaders "completely eliminate" stutter is absolute. I found nothing in Valve's notes that supports it.
- The $120 licence and the $1,000-versus-$880 example: The article calls these a hypothetical and a ballpark. Windows pricing varies by market and by retailer. Many PC owners already have a licence, and OEM builders pay different rates. Treat the savings as conditional, not as guaranteed money for a better GPU.
- Anti-cheat: Compatibility is title-specific and changes over time. One third-party guide notes that games using kernel-level anti-cheat often won't run properly on SteamOS. Check each game's current status, especially Valorant with Riot's Vanguard, before you commit.
- Market impact: Prebuilt makers abandoning Windows "en masse" is the author's prediction. No evidence of that shift was presented.
Should you try it?
If you want to experiment, use a spare drive and not your Windows install.
- Confirm your GPU is AMD, ideally RX 6000 or 7000 series, and read Valve's SteamOS installation and repair page for your hardware.
- List the games and launchers you depend on. Check them for anti-cheat requirements and Proton compatibility.
- Back up your data, and expect to disable Secure Boot for the install.
- Stay on the stable channel unless you specifically want to test 3.9 previews.
- Keep Windows available, either dual-booted on a separate drive or at least with a recovery option, until your library runs reliably.
Bottom line
The eTeknix headline is the opinion. Valve has extended SteamOS from its own handhelds to generic AMD desktops, and it keeps polishing the platform: 3.8.28 is stable and 3.9 is in preview. But official status is limited to a few devices, custom installs are still beta, Nvidia isn't supported, and anti-cheat remains a per-game gamble.
For Microsoft, the real pressure isn't a sudden exodus. It's that a credible, free, gaming-first alternative now exists, and Windows 11's own habits are what push people to test it.