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PC Gamer
PC Gamer
Andy Edser

Valve appears to be testing Arm64 support in Proton but I wouldn't get too excited about an Arm-based Steam Deck 2 just yet

Valve Windows Android Qualcomm
A Steam Deck LCD on a wooden desk, with the SteamOS menu screen on the display.

Eagle-eyed users have spotted a test application on SteamDB suggesting that Valve is experimenting with Arm64 support for Proton, the software that enables Windows games to run on Linux systems.

The changelog for ValveTestApp3043620 lists several popular games—including Left 4 Dead 2, Garry's Mod, Kerbal Space Program and more—with added tags like "proton-arm64", "proton-arm64e" and "protonarm64ec-vanguard" (via Notebookcheck). 

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