16 PIN GPU CABLE: The maximum power for the Nvidia 12-pin adapter cable can reach 600W, supports RTX4090 overclocking, thicker tinned copper core to ensure that withstands large voltages without heating. male to male connector,12+4 pin directly connect to the RTX 3090/4080/4090 graphics card; the 3*8pin adapter connects to your old modular power supply, which has over 3 PCIE/VGA adaptor, so you dont need to buy a new ATX 3.0 power supply. Designed for RTX 3090Ti 4070Ti 4080 4090: this PCI-Express 5.0 GPU power cable is designed for GeForce RTX 3090 Ti 4070Ti 4080 4090 Graphics Cards. It is a 3x8-pin(6+2) to PCIe 5.0 12VHPWR power cable. The PCIe 5.0 graphics cards will be powered from a modular power supply through only three 8-pin(6+2 pin) to one 16-pin cable adapters. NoteThis GPU power cable is not suitable for 12pin RTX 3090 Series GPU. Only support 12+4pin female GPU like RTX 3090Ti 4070 Ti 4080 4090 Series. Notice!!! 1, Ensure your PSU is 1 of the brand ASUS/ EVGA/ Seasonic Fully