ULT-Best ATX 24 Pin Dual PSU Power Supply Extension Mining Cable for Computer Adaptor Cable 24Pin 20+4pin 30CM

Dual PSU cable. Secondary Power Supply Unit adaptor. Add a second PSU to your PC
Connect 2 Power Supply Units together to provide more power to your computer components without having to upgrade your existing Power supply unit.

This is safe as the motherboard gets power from one PSU only. The second PSU provide power to other components. Both PSU start when the On / Off button of your PC is pressed.

We use high quality 18AWG full copper material, make it more durable.

Note: Please use the outputs from the 24pin power supply only on motherboard. 
And use the outputs of the 2pin power supply solely for devices ---such as hard drive, cd rom, dvd, etc..... 
Please do not mix the power from first and second power supplies.