Like in all games, If you have a AM 4 motherboard get 5800x3D, you are buying new get 13600k. Difference is marginal, i have a 5800x3d it's really smooth in Vicky3 except late game when it slows down a bit, not sure if it's the cpu or the gpu though. I run an older graphics card, 2700super and vicky is quite GPU heavy also ,i think it's gpu bound.