With PCIe 5.0 and ATX 3.0, the single connector and cables means a consumer could plug a 450-watt GPU that would have taken a triple 8-pin connector in the past, into a 650-watt ATX 3.0 power supply.

I have an Antec True 550 EPS12V power supply and was hoping to use it on an MSI dual Athlon MP board (K7D Master L). Anyway, Antec's site indicates ...

The upcoming RTX 4060 and 4060 Ti will also likely feature 8-pin cables, a departure from Ampere. Nvidia used the 16-pin cable on all its Founders Edition GPUs, including the RTX 3060 and Ti variants.

The Hela 2500Rz comes with four 12V-2x6 power connectors and utilizes the latest ATX 3.1 and PCIe 5.0 standards. It's burly enough to run four RTX 5080 GPUs, one of the best graphics cards .

TL;DR: NVIDIA's RTX 5090 graphics card requires 4 x 8-pin connectors for 600W power officially, but can operate with 3 x 8-pin connectors at 450W, seemingly running only 5% slower in 4K benchmarks.

The extra 8-pin connector adds an additional 252W to the motherboard, bringing the total to 420W, ... though MSI is pitching it as offered on its newest ATX 3.1 slash PCIe 5.1 power supplies.