How to Choose a PSU — Wattage Calculator Guide 2026

How to Choose a PSU — Complete Buying Guide

The PSU is the heart of your gaming PC. Pick wrong and you risk shutdowns, instability, or component damage. Here\’s how to choose right.

Wattage Calculator

Add 20% headroom for transient spikes (especially RTX 5000 cards).

80+ Efficiency Ratings

• 80+ Bronze: 82% efficient — budget tier
• 80+ Gold: 87% efficient — sweet spot ⭐
• 80+ Platinum: 90% efficient — high-end
• 80+ Titanium: 92% efficient — enthusiast

ATX 3.1 / PCIe 5.1 — Required for RTX 5000

RTX 5070-5090 cards use the new 12V-2×6 connector (16-pin). Older PSUs need an adapter. ATX 3.1 PSUs include the cable natively and handle 200% transient power spikes.

Modular vs Non-Modular

• Full Modular: Remove unused cables — cleaner builds ⭐
• Semi-Modular: Main cables fixed, peripherals modular
• Non-Modular: All cables fixed — cheapest, messy

Our Top PSU Picks

Browse our Power Supply collection — Corsair RM850e ATX 3.1 ready, RM1000x for RTX 5090 builds.