With a view to the launch of the RTX 3090 Ti, two very clear things are expected: higher power consumption that will test current power supplies, and a new power plug standard for high-end graphics cards. It won't be something that a, say, RTX 3050 will have; but yes something will need the most powerful consumer graphics cards, since graphics capability comes with a high energy demand.
In addition to the RTX 3090 Ti, a higher energy demand is expected for the rumored RTX 4000. They are expected to arrive this summer or fall, and they will be extremely powerful, but extremely demanding in terms of energy. This is why it is expected to establish a new 12 + 4 pin plug, of which 12 of them feed the energy, while the additional four inform the card of the energy capacity that it can expect from the power supply to the one that is connected.
NVIDIA gives you a cable to connect the RTX 3090 Ti to your current power supply
Current power supplies, except for the most recent ones that have just been released; they do not have a dedicated pin for PCIe Gen5 power supply. NVIDIA would have decided include a cable that transforms three 8-pin inputs from the power supply in one of PCIe Gen5.
This information comes from the Videocardz portal, which has this supposed information about how NVIDIA would deal with practically all users not having a power supply ready for the RTX 3090 Ti. Your solution is this cable that allows an exit 12VHPWR in exchange for three eight-pin outputs.
One of its drawbacks is that a very powerful power supply will be needed. In order to use this three-to-one converter, your power supply must have at least three available 8-pin PCIe power connectors.
In addition, it is stated that the adapter is capable of supplying 450 watts of power to the graphics card and 75 through the PCIe bus. That would correlate with a leaked TGP number and rumors of the GeForce RTX 3090 Ti graphics card. The fact that these mechanical adapters will not allow the graphics card to communicate with the power supply is important to note because this is an option that seems to be reserved for ATX 3.0 power supplies at the moment. This will most likely be implemented as a temporary measure until power supply manufacturers transition to ATX 3.0 power supplies.
Source: Guru3D