Valve will finally let you build your own Steam Machine with SteamOS for desktop:
Quote Originally Posted by The Verge
If you don’t get lucky with Valve’s Steam Machine reservation system, you can make your own Steam Machine instead.

Valve says that “starting with the SteamOS 3.8 release, you can put together your own Steam Machine using whatever PC parts you want.”

SteamOS 3.8.10 launched last week with a slew of updates, including “improved compatibility with recent Intel and AMD platforms.”

Alongside that improved compatibility, Valve is giving gamers the green light to install SteamOS on their own desktops.

In an interview with The Verge, Valve’s Pierre-Loup Griffais said Valve has been “rolling out improvements to [SteamOS] so it’s more compatible with desktop hardware,” including eventual support for Nvidia graphics.

Griffais says Valve has “a growing team” working on Nvidia driver support for SteamOS, adding, “We’re collaborating with Nvidia very closely.” While he mentioned that Nvidia support might not come this year, Griffais emphasized that “it’s certainly something that we’re working on in the background.”