The CPU handles general processing, the GPU handles graphics, RAM holds active work and an SSD stores files. For games, choose a target resolution and frame rate, then compare the GPU, CPU and monitor together. For laptops, also check weight, measured battery life and upgrade options.
For a build, check motherboard socket and BIOS support, RAM type, case clearance, cooling and PSU connectors. For a used PC, verify Windows 11 support, SSD health and battery condition. Compare benchmarks from the same test version and workload.