I'm excited to see what the new rdna plus pcie 4 can deliver. The bond between the two is that AMD specified that Navi RDNA has performance gains when paired with pcie4.0. It's not a guess as to whether or not it can saturate bandwidth or if it is needed. It was specifically mentioned that the architecture is vastly more powerful over pcie4. I'm probably going to get one. I'm not comparing to rx cards pound for pound.