Microsoft opened preorders on Wednesday for the Surface Laptop Ultra, a 15-inch Windows machine built around Nvidia's RTX Spark chip, at a starting price of $2,599 with deliveries beginning October 16. A desktop sibling, the Surface RTX Spark Dev Box, is listed at $5,999 and ships in November, according to Microsoft's announcement post. Nvidia announced the RTX Spark program in June with few details, TechCrunch notes, and I now know I need a bigger coffee budget.
The chip is the story. RTX Spark is what Nvidia calls a superchip, engineering shorthand for a CPU and a GPU sharing one package and one pool of memory. Nvidia's post from the launch event puts the numbers at a Blackwell RTX graphics processor with up to 6,144 cores, a Grace processor with up to 20 Arm-based CPU cores, a 600 gigabyte per second link between them, and up to 128 GB of memory that both sides can use.
That last figure is the one to remember. On a normal laptop the graphics chip gets a few gigabytes of its own, so a large AI model does not fit. Unified memory knocks down the wall between two small apartments so the model gets the whole floor. Microsoft says the result can run models exceeding 120 billion parameters locally with up to one petaflop of AI performance, a figure its own footnote ties to FP4 arithmetic with sparsity, which is the most flattering way to count.
FP4 means storing each value in four bits. It is coarse, like rounding every supermarket price to the nearest dollar, but modern models tolerate it well and it fits four times as many values in memory as 16-bit numbers do. Microsoft lists the machine at under 18 mm and under 4.5 pounds, with user-removable storage and a magnetic USB-C charging port it says is a first for laptops.
Pricing climbs fast. TechCrunch reports a second base model with a more powerful chip from about $3,700 and a top configuration at $5,900, which Microsoft says is already sold out, plus up to $1,000 cash back for buyers who trade in a MacBook Pro. Nvidia's post lists Acer, ASUS, Dell, HP, Lenovo, MSI and Gigabyte alongside Microsoft as makers of RTX Spark laptops, with compact desktops arriving in November.
The software half matters as much as the silicon. Microsoft announced general availability of Microsoft Execution Containers, a Windows feature that confines an AI agent to a sandbox, and TechCrunch reports that chief executive Satya Nadella said it is coming to all Windows 11 users. TechCrunch quotes Nadella at the event: "One of the things we realized in the last 3-4 years is that just having a model doesn’t do much for anything. You really do need to orchestrate, and you need to have memory outside of the model."
Nvidia chief Jensen Huang spent part of a fireside chat with Nadella on history, and Nvidia's post quotes him: "If not for Windows there would be no GeForce." The bet underneath the nostalgia is plain. Nvidia wants CUDA, the software stack that keeps developers on its data center chips, on the laptop in the bag too, and Microsoft wants the developers who drifted to Apple back on Windows. The trade-in offer says who they think is holding the bag.
What the launch does not settle is how these machines perform on real work. The petaflop figure is theoretical and sparsity-assisted, the 120 billion parameter claim is Microsoft's own, and no independent benchmark accompanied either number on Wednesday. The specifications are real. The verdict waits for someone to run the models.
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