Is there something to do in the BIOS?
Any suggestions for which 24 Pin Male to Female Dual PSU Power Supply Cable to buy?
Thank you guys!
Better use such adapters
https://www.aliexpress.com/item/1005002440937817.html?https://www.aliexpress.com/item/1005002319626574.html?You don't need to configure anything in the BIOS.
Be sure to connect the motherboard and hard drive from the main power supply. Connect only video cards and a raiser for them from the second power supply unit.
No need to connect the video card from the first power supply and the raiser from the second