I’m running a 4070 super on my setup with cachyos with zero issues. I never had to do any special setup or anything. I think when I first installed, I was running off the displayport on my motherboard to be safe, but if I remember correctly, the OS detected my Nvidia card and installed the driver automatically. (That or I selected that I wanted Nvidia drivers during the install, I can’t remember which.) Switched the cable over to the card, no issues since.
Everyone complains about Nvidia support on Linux but it’s come a long long way the last few years and it’s honestly just as easy or easier than windows now.