Microsoft just dropped something absolutely massive for local-AI lovers — the new Surface RTX Spark Dev Box is out there in real life! Announced at Build 2026 as part of that weekend's big Microsoft event (alongside the brand-new Surface Laptop Ultra), this miniature surface-powered PC looks like it was sculpted from a cross-section of an Xbox Series X console, with its aluminum chassis cleverly doubling as a heatsink. The whole thing runs on Nvidia’s fresh Arm-based RTX Spark chips — and here is where Tom Warren's article really sold me: Microsoft gave it a 100W thermal envelope compared to the usual 45-80 watt range found in standard laptops, which means sustained workloads actually stay fast instead of throttling after twenty minutes. The real party trick? It ships with a generous 128GB of unified memory — big enough to load up and run local models as large as 120 billion parameters entirely offline without calling home once — making it genuinely capable for serious inference tasks that previously required either cloud costs or expensive workstation gear. And Microsoft is pre-configuring these bad boys at the image level with Windows 11 Pro plus apps like Visual Studio Code and GitHub Copilot loaded right out of the box, so devs won't have to spend an afternoon chasing down drivers before they can start testing their models — this could be a massive catalyst for anyone trying local-first AI development without getting crushed by cloud APIs. Source: https://www.theverge.com/news/941271/microsoft-surface-rtx-spark-dev-box-specs-availability