Computer Power Requirements

| Component | Typical Idle | Typical Load | Peak Transient | Notes | |-----------|-------------|--------------|----------------|-------| | | 35W | 250W (PL2) | 350W+ | PL2 is 253W, but boards often ignore it. | | AMD Ryzen 9 7950X | 40W | 200W (PPT) | 250W | Efficient architecture, but boosts aggressively. | | NVIDIA RTX 4090 | 50W | 450W | 660W (0.1ms) | Critical: Transient spikes up to 2x average load. | | AMD Radeon 7900 XTX | 45W | 355W | 550W | Better transient control than Ampere, but still spiky. | | DDR5 RAM (2x16GB) | 3W | 10W | 12W | Per module. Higher speeds (6000+) increase draw. | | NVMe SSD (PCIe 5.0) | 0.5W | 11W | 14W | Heatsinks mandatory; 4.0 drives are ~7W. | | Fans (per 120mm) | 0.5W | 2W | 3W | RGB adds ~1W per fan. | | AIO Pump | 3W | 6W | 10W | D5 pumps in custom loops: 20-40W. |

Whether you are building a custom gaming rig or setting up a standard home office, understanding is critical for system stability and longevity. Selecting an inadequate Power Supply Unit (PSU) can lead to unexpected shutdowns, data corruption, or even hardware failure. 1. How Much Power Does Your PC Actually Need? computer power requirements