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Surface Pro X running Windows 10 Pro on ARM does not install 64-bit applications that have not been ported to ARM.
LTE models of Surface Pro X come with Windows 10 Pro on ARM.
Wi-Fi models of Surface Pro X come with Windows 11 Pro on ARM. Available storage is subject to change based on system software and updates and apps usage. System software and updates use significant storage space. Comparison of Surface Pro X (774 g) and Surface Pro Signature Keyboard (280 g) measured by Microsoft and 2020 iPad Pro 12.9-inch (682 g) and iPad Pro Magic Keyboard (688 g) published tech specs available at iPad Pro - Technical Specifications – Apple. Surface Slim Pen 2 can charge with Surface Slim Pen Charger, Surface Pro Signature Keyboard, Surface Pro X Signature Keyboard, Surface Laptop Studio, and Surface Duo 2 Pen Cover. Software license required for some features. Charger for Surface Slim Pen 2 sold separately. See aka.ms/SurfaceBatteryPerformance for details. Battery life varies significantly based on usage, network and feature configuration, signal strength, settings and other factors. Contact your service provider for details, compatibility, pricing, SIM card, and activation.
Service availability and performance subject to service provider’s network.