Today Valve announced 3 new additions to their Steam Hardware series expanding on the Deck to include a new Controller, Steam Machine, and finally the long-awaited replacement to the Index: the Steam Frame.
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The Steam Machine and Frame both have SteamOS installed and the Frame will have compatibility for x86 apps despite being ARM. And since it's not locked down, you can do whatever you want on it.
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https://store.steampowered.com/sale/hardware