12VHPWR 16-Pin to 8-Pin PCIe 5.0 PSU Adapter Cable

Compatibility: Design for RTX 3090Ti 4070Ti 4080 4090 GPU and all PCIe 5.0 GPUs with a 12+4pin connector, and for Corsair Power Supply ONLY, Doesn't

JOYJOM PCIe 5.0 12VHPWR Cable for Corsair: 16AWG 600W 12VHPWR Cable Dual 8 Pin PCIe to 16 Pin 12+4 Pin Male to Male for RTX 4090 4080 3090TI 4070Ti

Premium Sleeved 12VHPWR PCI-e 5.0 16Pin (12+4) to Triple 8-Pin GPU Power Extension Cable - Micro Connectors, Inc.

Fasgear PCIe 5.0 GPU Power Cable 70cm | 16Pin (12+4) 12VHPWR Connector for RTX 3090 Ti 4080 4090 | 3x8Pin (4+4) CPU Male Plugs Only for Corsair/Great

GeForce RTX 3090 Ti comes with 3 x 8-pin to PCIe 5.0 16-pin adapter

Micro Connectors Premium Sleeved 12VHPWR PCI-e 5.0 16-Pin (12+4) to Triple 8 -Pin GPU Power Extension Cable - Micro Center

NZXT 12VHPWR Adapter Cable - PCIe 5.0 PSU Cable

12VHPWR Adapter Cable

There are 8-pin in, 12VHPWR out adapters, but what about the other way around?

CPU/PCI-E Port 3*8pin to 16pin 12VHPWR PCIE 5.0 Adapter Silicone Sleeved Cable for GIGABYTE P750GM P850GM P1000GM Power Supply - AliExpress

Angled 12VHPWR 600W PCIe 5.0 Dual 8 Pin to 16 Pin Power Cable for Seasonic and Asus 12VHPWR-PM-SS-90A