Performance
Under the hood, the iPhone 5s was pioneering as the first smartphone to use a 64-bit architecture, powered by the Apple A7 chipset and a dual-core 1.3 GHz Cyclone CPU. Despite its 1 GB RAM limitation, the performance was notably smooth, enabling multitasking and smooth transitions within iOS 7, which could be upgraded all the way to iOS 12.5.6. Coupled with the PowerVR G6430 quad-core graphics, the iPhone 5s could handle a variety of applications and games with relative ease, embodying Apple's early aspirations for powerful mobile computing.