x570 motherboard, 5800X cpu or above, and some DDR4-3600 cas 16 or better RAM. Lot's of reviews out there for the various motherboards and RAM combos.
Also, invest in a 1TB or above NVMe drive to run the sim. You won't regret the loading speeds.
You are posting this all over the web. I also noticed you posted on reddit and took it down. You mentioned there you had a pop and flash with this new PC. I would suggest you consider the "pop and flash" may have damaged the motherboard or other component causing this issue.
Was your friend's name and address used to buy the card? If so, I'm sure they are saying he was the original owner and only he is allowed to step-up. However, if he purchased the card as a gift for you it seems you should be considered the original owner as it was unopened until you received it...