Microsoft’s tiny new dev machine takes on local AI workloads that Qualcomm couldn’t crack

Microsoft has quietly unveiled a compact desktop PC built specifically for developers working with large AI models locally. Dubbed the Surface RTX Spark Dev Box, the machine is powered by Nvidia’s new Arm-based RTX Spark chip—the same silicon inside the recently announced Surface Laptop Ultra—and is engineered to sustain heavy computational loads without throttling. The device resembles the top of an Xbox Series X, with an aluminum chassis that doubles as a heatsink. Its 100-watt thermal envelope exceeds the 45-to-80-watt range typical for RTX Spark laptops, and it packs 128GB of unified memory. That’s enough to run models with up to 120 billion parameters directly on the hardware, eliminating the need to shuttle data to the cloud. Microsoft preconfigures the Dev Box with Visual Studio Code, GitHub Copilot, and a developer-focused Windows 11 Pro image. “Dark theme, simplified taskbar, no Widgets, Do Not Disturb on, Developer Mode enabled, and PowerShell 7 as the default shell,” says Andrew Hill, corporate vice president of Surface. The Dev Box fills the void left by Qualcomm’s canceled Snapdragon Dev Kit, a miniature Windows on Arm PC that was supposed to ship two years ago but was scrapped due to hardware quality issues. Now, Microsoft is stepping in with a direct alternative, joining other OEMs that are building mini PCs around Nvidia’s RTX Spark chips. Pricing and full specs are still under wraps, but the Surface RTX Spark Dev Box will launch later this year in the US through Microsoft’s online store.