Power 2500 W
The FSP company is preparing a power supply Cannon Pro 2500W with a power of 2500 W, to which technically you can connect five GeForce RTX 4090.
In addition to enormous power, the device is distinguished by the presence of four PCIe 12V-2×6 power connectors — This is an updated and fireproof version of the 12VHPWR. At the very least it should be fireproof. In addition, there are three regular eight-pin power connectors for video cards.
That is, this set is enough to connect five RTX 4090 or five other video cards with a 12VHPWR connector, you just have to use an adapter for one. Considering that on average the RTX 4090 consumes about 350 W in games, the power of such a power supply will also be enough for the specified set. True, more than one video card will still not work in games, and in applications where several adapters can be used, consumption may be higher.
It remains to be added that the power supply offers fully modular cabling and will be released next year.