Hipesen 12+4-pin Pcie 5.0 Power Connector 12VHPWR PCle 12+4p Power Supply and 3090TI Card 12+4P Modular Cable Compatible with 600W Power - Newegg.com
Corsair Modular Cable 600W PCIe 5.0 12VHPWR Type 4 PSU Power Cable Dual 8pin to 16pin PCI-e Gen 5.0 Suppport RTX3090Ti RTX4090 - AliExpress
ATX 3.0 PCIe 5.0 600W 4 x 8 Pin to 12VHPWR 16 Pin Power Adapter Cable - MODDIY
Amazon.com: Pcie 5.0 GPU Power Cable,16AWG ATX 3.0 12VHPWR PCI-E Cable,600w 16pin (12+4) 12VHPWR Male to Male Pcie 5 Power Cable for Geforce RTX 3090Ti 4070 Ti 4080 4090 to Modular Power