Microsoft has unveiled the Surface RTX Spark Dev Box, a compact desktop PC powered by Nvidia’s RTX Spark superchip. The device is aimed at developers who need local AI performance without using a laptop.
The new machine follows the Surface Laptop Ultra, which also uses RTX Spark. However, the Dev Box is designed for sustained desktop workloads, including long training jobs, large model inference, and agentic AI pipelines.
The Surface RTX Spark Dev Box delivers up to 1 petaflop of AI compute and 128GB of unified memory. Microsoft says that it is enough to run 120B plus parameter models with up to a 1 million token context locally at interactive speeds.
RTX Spark combines an Nvidia Blackwell RTX GPU with an Nvidia Grace CPU. Nvidia lists the platform with 6,144 CUDA cores, fifth-generation Tensor Cores with FP4 precision, and a 20-core Nvidia Grace CPU connected through NVLink C2C.
The unified memory setup allows the CPU and GPU to share the same memory pool, making the system more suitable for large AI models than consumer graphics cards with smaller dedicated VRAM limits.
The Dev Box ships with Windows 11 Pro preconfigured for developers. At first setup, it includes a dark theme, simplified taskbar, Developer Mode, Do Not Disturb, and PowerShell 7 as the default shell.
Microsoft has also preinstalled VS Code, GitHub Copilot, Git, Python, and Node.js. WSL 2 comes configured with GPU passthrough and CUDA support, allowing developers to work across both Windows and Linux-based AI tools.
Microsoft is positioning the Dev Box as a way to keep more models, data, and intellectual property local. The device supports model conversion, fine-tuning, and evaluation through AI Toolkit for VS Code, Windows ML with TensorRT, Windows Copilot Runtime, and Microsoft Foundry.
The system is built as a secure core PC and supports BitLocker, Microsoft Defender, Entra ID, and Intune. Microsoft says the security approach follows its Zero Trust principles.
The Surface RTX Spark Dev Box uses an anodized aluminum 3D printed body with 1,000 air vents built into the grid chassis. Microsoft says the vent count is a reference to the device’s 1,000 teraflops of compute performance.
The aluminum chassis also works as part of the cooling system. The device has a 100W thermal envelope designed to keep performance consistent during long AI workloads.
The Dev Box includes two USB-C ports, one USB-A port, HDMI, Ethernet, and a headphone jack. It can work as a main development machine with external peripherals or as a local AI system accessed remotely from another computer.
The system is designed for developers building and testing AI agents, local inference workflows, and model fine-tuning before moving projects into production.
The Surface RTX Spark Dev Box will be available later this year. In the US, it will be sold through Microsoft’s website.
Microsoft has not announced pricing yet. The company also notes that the product is still in prerelease form, and features may change before launch.
