GameLab Pillar Guide
How to Choose the Right Power Supply (PSU) for Your Gaming PC
2026-08-27
8 min read
Fact-Checked
Essential Rules for PSU Sizing
A power supply should never operate at 100% capacity continuously. Sizing your PSU for 50% to 75% load maximizes electrical efficiency, lowers fan noise, and safeguards against sudden GPU transient power spikes.
Recommended PSU Wattage Table
- RTX 4060 / RX 7600: 550W – 650W PSU
- RTX 4070 / RX 7800 XT: 650W – 750W PSU
- RTX 4080 Super / RX 7900 XTX: 850W – 1000W PSU
- RTX 4090 Enthusiast: 1000W – 1200W ATX 3.0 PSU
Calculate Your Exact PSU Requirements
Calculate combined component TDP, transient headroom, and efficiency class with our free tool.
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