Microsoft's most powerful Surface Laptop goes on sale on 16 October, starting at $2,599. Its Nvidia RTX Spark chip pairs a Blackwell RTX GPU with up to 6,144 cores and a Grace CPU with up to 20 cores, sharing up to 128 GB of unified memory. Microsoft says it can run AI models of more than 120 billion parameters locally, with up to 1 petaflop of AI performance (a sparse FP4 figure). It has a 15-inch 120 Hz touchscreen that peaks at 2,000 nits in HDR, is under 18 mm thin and 4.5 lb, and comes in Platinum and Nightfall.