Nvidia RTX Spark laptops are shipping now — and they’re the first Windows PCs built on Arm that promise identical performance whether plugged in or running on battery. The chip debuted inside the Surface Laptop Ultra, priced at $2,599 in the US and Rs 2,59,999 in India, with MSI’s Prestige Flip N16 also confirmed as an early adopter. No other models, prices or launch dates beyond those two devices appear in the reporting.  The RTX Spark is not a GPU add-on or a discrete graphics card. It’s a full system-on-chip, integrating CPU, GPU, AI accelerators and memory controllers. Built on Arm architecture and designed specifically for local agentic AI workloads. That means it runs Windows 11 on Arm, not x86. Emulation is required for legacy apps, and Tom’s Guide explicitly flags that as a potential efficiency concern.  What’s new isn’t raw speed, it’s consistency. At IFA 2026, Nvidia showed a Surface Laptop Ultra running Blender for 5.5 hours on battery before hitting the 10% warning. That same device ran Unreal Engine 5’s largest sample map without stuttering off the charger. And Gears of War: E-Day delivered identical frame rates on battery and AC power. A break from the steep performance throttling common in current Windows laptops when unplugged.  DLSS 4.5 is supported, and Nvidia says the chip’s Blackwell-derived GPU cores enable smooth 1440p gaming. But Tom’s Guide stresses there’s no published battery life figure beyond “all-day”, and no real-world screen-on time, video playback duration or productivity benchmark data yet. The outlet calls the claim “concrete only in theory” and says actual endurance testing remains pending.  This isn’t just about longer runtime. It’s about eliminating the split personality of modern Windows laptops: one machine when tethered, another when untethered. If the promise holds, it changes how developers, designers and AI researchers use portable hardware. Especially for sustained GPU-accelerated tasks like rendering, simulation or local model inference.  No other RTX Spark devices have been announced. No official specs sheet has been released. No third-party reviews with measured battery or thermal data exist yet. What we know comes entirely from Nvidia’s demos, Tom’s Guide’s hands-on observations at IFA, and the confirmed retail pricing of the two launch systems.  Surface Laptop Ultra shipments are live. MSI Prestige Flip N16 availability hasn’t been detailed. Nvidia’s broader rollout timeline, including OEM partners beyond Microsoft and MSI. Remains unannounced.