(Image credit: Tom's Hardware) A Reddit user has demonstrated that SteamOS, Valve 's Arch-based gaming operating system built around AMD silicon, can boot and run on an Intel Arc B580 discrete graphics card. Posting in the r/SteamOS subreddit as SaperPL, they documented the feat this week, pairing the Arc B580 with a Ryzen 5 5600 processor and getting Valve's full gaming-mode interface running on the card. The catch is that reaching that point took a Radeon card, a workaround for a broken installer, and a motherboard setting that nearly sank performance along the way. Go deeper with TH Premium: GPUs The opening exists because recent SteamOS beta builds quietly widened hardware coverage. Valve's changelog for the beta cites improved compatibility with recent Intel and AMD platforms, language clearly aimed at the wave of Intel-powered handhelds rather than desktop Arc cards.…