https://wccftech.com/atx-3-0-power-supply-standard-pcie-gen-5-0-up-to-1800w-power-excursions-next-gen-graphics-cards/

Recently, PCWorld did an interview with Intel's Platform Power Specialist, Stephen Eastman, to talk about the brand new ATX 3.0 Power Supply standard. The new ATX 3.0 standard brings a lot to the table such as the latest PCIe Gen 5 12VHPWR connectors which will power the future generation of graphics cards and other PCIe devices.

One of the main things that ATX 3.0 power supplies will be addressing is 'Power Excrusions' or Power Spikes as they are simply put. As per the PCI-SIG, a graphics card has the capability of exceeding its maximum sustained power by 3 times. This is particularly true for the brand new standards and for cards such as the NVIDIA GeForce RTX 3090 Ti which has a TGP rating of 450 Watts, this could mean that the card can have spikes of up to 1350 Watts. There are reports that the upcoming generation of GPUs will require up to 600W of power and that would indicate up to 1800W spikes.