Interesting thread, so we established a 1080ti is wasted on ryzen due to bottleneck. Is that down to resolution op wants. Would that disappear if he had a 144hz monitor or a 4k?
If at 144hz+ like myself then the differences can be seen even with a 1070. Albeit not as much.
When the next mid range GPU's release that are as quick as the 1080ti it would be wise to upgrade the CPU. The whole value idea behind ryzen then falls away imo.