Nvidia has already launched the RTX 3090ti with the 16 pin power connector .i.e. 12 power pins and 4 data pins.
In this launch version of the 3090ti we see only one such power connector. There are possibilities that there may be some cards which may launch with two such connectors if not at least the next gen. The maximum power draw on each of the connector is set at 600W. That’s a missive jump compared to what’s available today. Gigabyte has already announced a new power supply model UD1000GM 5.0 compactable with all PCIe gen-5 graphics cards. Currently all the sub-vendors are shipping their 3090ti with an adaptor which can be used with their current power supply.

As per videocardz.com Gigabyte has confirmed that their new next gen graphics cards will require the 16 pin power cable or an adaptor to comply with the PCIe-5 specs. So if you are planning to buy the next-gen graphic cards you will also have to upgrade your power supply. Rumors state that the next gen 40 series graphics cards from NVIDIA will be power hungry. The mid to high end graphics cards are rumored to be around 450W to 600W and above.