ATX 3.1 explained: does your next GPU need a new PSU?

Modern high-end graphics cards pull sudden power spikes far above their rated draw. The ATX 3.0 spec and its 3.1 refresh were written for exactly that: the 12V-2x6 connector carries up to 600 W down a single cable, and the standard demands the supply ride out those spikes without shutting off.

Run a current flagship GPU and an ATX 3.1 unit clears away the adapter clutter and the tripping risk. For a mid-range card, a good ATX 2.x supply is still fine. We fold ATX-spec readiness straight into our scoring, so you can rank supplies by it.

See our power-supply rankings for high-power builds, or the efficiency ranking if a quiet, cool machine matters more.