Surface RTX Spark Dev Box is Microsoft’s new compact AI developer PC. It is built for people who want local model work without renting cloud GPUs for every experiment.
Microsoft announced the machine at Build 2026 in a Windows Devices Blog post. The pitch is simple. Put NVIDIA RTX Spark hardware, Windows developer tooling, and security controls into a small desktop box.
The device uses NVIDIA’s RTX Spark superchip. It pairs a Blackwell RTX GPU with a Grace CPU. Microsoft says the box can deliver up to one petaflop of AI compute with 128GB of unified memory.
That memory pool is the headline for local AI work. Microsoft says it can run 120B-plus parameter models with up to a 1 million-token context locally at interactive speeds.
A Windows box for local AI work
Surface RTX Spark Dev Box ships with Windows 11 Pro tuned for developers. Microsoft says Visual Studio Code, GitHub Copilot, Git, Python, Node.js, WSL 2, PowerShell 7, and CUDA support are preconfigured.
The hardware is also built for sustained loads. Microsoft says the anodized aluminum body doubles as a cooling system. It has a 100W thermal envelope and 1,000 air vents in the chassis.
The port list is practical for a desk box. You get two USB-C ports, USB-A, HDMI, Ethernet, and a headphone jack.
Powerful, but still pre-release
The product page calls Surface RTX Spark Dev Box a pre-release product. Microsoft also says shipment depends on successful FCC equipment authorization. Price, final availability timing, and real sustained performance are still open questions.
The direction is clear, though. Microsoft wants a Surface-branded local AI machine for developers who use local agents, Windows, WSL, CUDA, Copilot, and Foundry. It also gives Microsoft a desktop answer to the broader RTX Spark push we covered in our NVIDIA RTX Spark Windows PC story.
