https://www.gpucheck.com/ja-jpy/compare/nvidia-geforce-gtx-1660-ti-vs-amd-radeon-rx-vega-56/intel-core-i7-8700k-3-70ghz-vs-intel-core-i7-7700k-4-20ghz/

VEGA56はここ見る限り1660tiとほぼ同等だから1660tiだとキツイか・・・