@ HartyBart

Thank you very much for your answer.
I see that I had to lay out the specs of my currend PC to provide the necessary information.
So, my CPU is an Intel Core i7x980 3.33GHz from 2010.
The mainboard is an ASUSTec P6x58D Premium from 2010
The original build had an ATI GPU Radeon HD 5970 Card installed, which was replaced by an Nvidia Gforce GTX 1650 3 years ago. 
I guess the necessary connectors are already in place to run an AMD card again.
The OS is Windows 10 pro and my Poser is version 13 latest edition.
Currendly 16GB of DDR3 RAM is installed and the power supply has 750Watts.
The machine is old, but it works for 14 years absolutly stable and reliable.

I find the way Nvidia distributes graphics cards a bit confusing. On Amazone you get as search results for Nvidia RTX 3060 several different brands and models like Asus or Gigabyte or Zotac and every card has editions.
Thats not really helpful, isn't it?