| Component | Typical Wattage | |-----------|----------------| | CPU | 65–250W | | GPU | 75–450W | | Rest (fans, drives, RAM) | 50–75W |

To determine what power supply you need, focus on your PC’s and efficiency rating . Here’s a quick, practical guide: 1. Estimate your system’s peak wattage Use a PSU calculator (OuterVision, Cooler Master, or Be Quiet!) or add up these typical values: