PC & Gaming Guide

How to Choose a PC Power Supply

Learn how capacity, connectors, efficiency and build quality affect a dependable PC power supply.

Estimate system load

Use CPU and GPU recommendations as a starting point, allowing headroom for transient loads and future upgrades. Verify calculator assumptions against your actual components.

Check connectors and fit

Modern graphics cards may need specific power connectors. Confirm the PSU has the correct cables and fits the case. Never mix modular cables between PSU models.

Look beyond efficiency

Efficiency ratings do not alone establish component quality. Look for independent tests of voltage regulation, protections, noise and warranty. A reliable PSU can outlast several builds; see build basics.

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