Steam Machine review: compact SteamOS hardware replaces high-end desktop for some users

Steam Deck HQ published a long-term review of Valve's Steam Machine from a user who sold their high-end RTX 5090 / Ryzen 7 9800X3D desktop after two months. The reviewer praises the compact device's cooling and noise levels under sustained load, the portability of the small form factor, and SteamOS's gaming-focused optimizations including Proton integration and Quick Access performance controls. The review also notes significant limitations: kernel-level anti-cheat systems block major multiplayer titles like Valorant and Fortnite from running on SteamOS.

What the Steam Machine delivers and where it falls short

• Form factor and thermals: The reviewer reports sustained gaming loads (e.g., Crimson Desert) run with minimal fan noise and controlled temperatures in a chassis significantly smaller than typical DIY small-form-factor builds
• SteamOS performance: Desktop Mode with keyboard and mouse is described as more usable than on Steam Deck; Gaming Mode provides Quick Access controls for FPS limits, V-Sync, and performance settings without leaving the game
• Proton and game optimization: The reviewer cites Baldur's Gate 3 running at 4K/Ultra/60 FPS as an example of Steam Deck-targeted optimizations benefiting the more powerful Steam Machine hardware
• Anti-cheat limitation: Kernel-level anti-cheat systems designed for Windows remain unsupported on Proton/Linux, rendering games including Valorant, Fortnite, and Call of Duty unplayable on SteamOS

Why it matters

The review illustrates how Steam Deck's market success has created a software optimization ecosystem that benefits subsequent Valve hardware, though the persistent anti-cheat gap remains a structural barrier to broader Linux gaming adoption.