Early leaks indicate the NVIDIA GeForce RTX 3090 Ti will include a 3x 8-pin to 16-pin PCIe Gen5 power adapter. Gigabyte has previously mentioned the idea of such an adapter in its PR for its UD1000GM PSU.
“Traditional power supplies need a three 8-pin to 16-pin adapter to support the latest PCIe Gen 5.0 graphics cards.”
It makes sense that the connector would be included, as most have probably not upgraded to a PSU with 12+4 (16-pin) connector. ASUS, GIGABYTE, and MSI (pictured below) have already announced new PSUs featuring the connector.
NVIDIA’s Founders Editions have a type of Gen 5 connector that doesn’t include the four “sense” pins for monitoring the power needs of the devices.
The NVIDIA GeForce RTX 3090 Ti is said to have a 450 W TDP, which explains why 2x 8-pin to 12-pin adapters would not suffice. The new 16-pin connector supports up to 600 watts of power delivery for high-power cards.