Valve has just introduced a preview of its SteamOS 3.8 operating system, designed for the Steam Deck and other upcoming hardware. This version marks a significant step toward enabling the future Steam Machine, as the SteamOS 3.8 preview build includes initial support for it. This update comes with a host of improvements, such as better support for third-party handhelds, reduced input latency of handheld controllers, optimized graphics drivers with performance and stability fixes, a new KDE desktop environment build, and support for a wider range of Intel and AMD SoCs. For the upcoming Steam Machine, we anticipate optimizations for a semi-custom six-core AMD "Zen 4" processor with 28 compute units of RDNA 3 graphics. Valve claims the PC can achieve 4K gaming at 60 FPS with ray tracing and FSR support. It features 16 GB of DDR5 system memory and 8 GB of GDDR6 VRAM, powering a semi-custom GPU that may be closer to AMD's RDNA 3.5 than pure RDNA 3. A complete changelog of added features follows.