What codec will the exported videos use? If using H.264/265, then GPU-accelerated encoding becomes an option. If using AV1 or DNxHR or ProRes or Ut Video or Huffyuv, then GPU doesn’t directly do the encoding and CPU becomes more important.
This chart is a bit dated but was pure cpu based on a benchmark @nwgat built a while ago(I think it used shotcut from 2016) but the basic scaling should apply today on the cpu side, the benchmark is still available, just not 100% 1:1 with the 2020 versions of shotcut, I’ve tried to prod nwgat to update it but never got a response. The T7500 is actually my day to day desktop and what I still use to edit today alongside a quadro P4000, I droped some gpu information in your other thread as well.