GPU TDP + CPU TDP + 100W (mobo, RAM, drives) × 1.25 (headroom buffer)
Here’s a ready-to-post guide for a — perfect for a blog, Reddit (r/buildapc, r/pcmasterrace), or social media. Title: 🔧 Don’t Underpower Your GPU – Use This Wattage Calculator Before You Buy a PSU gpu wattage calculator
RTX 3070 (220W) + Ryzen 5 (65W) + 100W = 385W × 1.25 = ~480W minimum → get a 550W–650W PSU. GPU TDP + CPU TDP + 100W (mobo, RAM, drives) × 1