So, as you state here above:
IS IN NOT THE SAME AS HERE:
"Only one is required not two. As for the power connections, 1x PCIe 8-pin is required for the RTX 3060 Ti. as seen at both the nVidia and ASUS web sites. If there is no 8-pin PCIe from the HP's power supply, then often an adaptor such as SATA to 8 Pin will work OK for the card. "
So, the graphics card RTX 3060 Ti is for the newest PCs, and this PC is too old... for this card.
Updating RAM or Graphics Card is NOT advantageous and not recommended for such an old PC, rather you can buy a new PC, and this is an exceptionally good decision...
FOR MY PURPOSE OF VIDEO EDITING, GRAPHICS DESIGN, AND PHOTO EDITING,
BEST TO HAVE A BETTER PC EG from the 2020-year model and up... or better.
Also, if NO FUNDS/MONEY FOR A NEWER WORKSTATION...
This PC - HP z620 - is better for older graphics cards, the graphics card RTX 3060 Ti needs ONLY one power connector, AND MAYBE WORKING WITH Z620...
IS THIS correct...??? TRUE?
SEE ATTACHMENTS HERE: