So I got my new GPU, Gigabyte RX 6700XT Gaming OC version(12GB VRAM). I was originally searching for rx6600 because I only have 430W PSU(and 5800X CPU). But then I got an incredible opportunity to buy that one in excellent condition(with the box etc.) for only 150eur.
I had to buy molex=>8pin power cable because my PSU had only 6pin. PSU is Seasonic S12-II 430W which I have now for years, maybe decade. I upgraded computer several times while keeping this PSU and its still working without problems.