A 12VHPWR cable can deliver 600W for high-end GPUs (and upcoming PCIe 5.0 ones). It’s part of Intel’s ATX 3.0 standard.
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12VHPWR and ATX 3.0: Gamer’s Guide

A 12VHPWR cable can deliver 600W for high-end GPUs (and upcoming PCIe 5.0 ones). It’s part of Intel’s ATX 3.0 standard.
The dynamic is fast-shifting from performance, heat, and noise considerations to electricity consumption and even rewiring your homes just to play a game decently on a new GPU. Where will this path lead us?
Directory of most reliable PC gaming parts manufacturers and buying guidance for those parts.