Gigabyte: PCIe Gen5 graphics cards to require either 16-pin power cable or "3x8-pin to 16-pin" adapter - VideoCardz.com
Fasgear PCIe 5.0 GPU Power Cable Sleeved | 16pin(12+4) 12VHPWR Connector for RTX 3090 Ti 4080 4090
GeForce RTX 3090 Ti graphics cards are bundled with 3x8-pin to PCIe Gen5 (16 -pin) power adapters - VideoCardz.com
Seasonic 12VHPWR Cable
PCI Express Gen 5 Power Connector Leaks, Offers up to 600W | Extremetech
Fasgear PCIe 5.0 GPU Power Cable Sleeved 70cm | 16pin(12+4) 12VHPWR Connector for RTX 3090 Ti 4080 4090 | Only for Corsair/Great Wall/Thermaltake Modular Power Supply
What you need to know about the new 16-pin PCIe 5.0 connector and PSUs - HardwareZone.com.sg
Seasonic 12VHPWR Cable
ModDIY ATX 3.0 PCIe 5.0 600W 12VHPWR 16 Pin to 16 Pin PCIE Gen 5 Power Cable MDY-12VHPWR-16P
16 Pin PCI-e (8+8) – PEXON PCS
4x 8-pin PCIe to 16-pin 12VHPWR GPU Power Cable for RTX4090 90-Degree Elbow NEW | eBay