I would recommend more. I have a rtx 2070 max q 8gb. For me that's more than enough, I render 8k maps, fibermeshes, displacement maps and normal maps all 8k. Use dforce and I am very happy. In the future I will upgrade if necessary. But for now I am set for a long while. 4gb is not that much, als do depended if the card uses turing or Volta techniques. Personally I would go for an more up to date card if that's in your budget. Or find an alternative card from a year or 2 prior with more vram.