Nvidia's 12-Pin Power Connector Will Work with Next-Gen PCIe 5.0-Compliant PSUs | Tom's Hardware
12-Pin to 2x8-Pin VGA Adapter | Cooler Master
Modular Power 12Pin to 2 port PCI-e 6+2pin Power supply Cable Dual GPU 8Pin for Corsair AX series AX650 AX750 AX850 - AliExpress
Amazon.com: CORSAIR 12-Pin Sleeved GPU Power Supply Cable for 3060, 3070, 3080, 3090 Graphics Cards : Electronics
Amazon.com: COMeap Replaement for Dual PCIe 8 Pin Male to Mini 12 Pin NVIDIA GeForce RTX 30 Series GPU Power Adapter Cable for EVGA Seasonic Modular PSUs 25-inch(63cm) : Electronics
The GeForce RTX 3080 Founders Edition has a 12-pin power connector, but it may be an NVIDIA-exclusive - NotebookCheck.net News
Amazon.com: EZDIY-FAB PSU Cable Extension 12Pin to Dual 8P,16AWG PCIe Sleeved Extension Cable for RTX 3060ti 3070 3080 3080ti 3090- White [300mm] : Electronics