Microsoft has unveiled the Surface RTX Spark Dev Box, a miniature PC targeting developers who need to run large language models locally. The device is powered by Nvidia’s Arm-based RTX Spark chip, the same silicon found in the newly announced Surface Laptop Ultra, but configured with a 100-watt thermal envelope. That’s a step up from the 45-to-80-watt range typical of RTX Spark laptops, which should help sustain long inference or fine-tuning jobs without throttling.

The Dev Box packs 128GB of unified memory, enabling it to load models up to 120 billion parameters entirely in memory. For context, that puts it in the same weight class as Apple’s M2 Ultra Mac Studio, but on a Windows-on-Arm stack. The aluminum chassis doubles as a heatsink, echoing the Xbox Series X thermal design—functional, if not flashy.

From a systems perspective, the real engineering story is what Microsoft does at the OS image level. The Dev Box ships with Windows 11 Pro pre-configured for development: dark theme, stripped taskbar, no Widgets, Do Not Disturb enabled, and PowerShell 7 as the default shell. Developer Mode is on by default. It also comes with Visual Studio Code and GitHub Copilot pre-loaded. This isn’t a consumer device tweaked for devs; it’s a purpose-built workstation image.

Nvidia’s RTX Spark already powers mini PCs from other OEMs, but this device effectively replaces Qualcomm’s canceled Snapdragon Dev Kit—a project that aimed to help port apps to Windows on Arm but stalled due to hardware quality issues. Microsoft is betting that Nvidia’s silicon and its own software configuration can avoid those pitfalls.

Pricing and full specs are still under wraps. The RTX Spark Dev Box will ship later this year in the US through Microsoft’s online store.

Source: The Verge