I have an old amd based build on "amd fx6100" and a "Sapphire Radeon r9 290 4gb tri x oc" and I would like to upgrade to amd's new ryzen 1600x. As for the gpu I was thinking a gtx 1070, but is that a worthwhile upgrade from my r9 290? Should I go with a gpu from amd instead? Should I keep my old gpu? Please! All feedback needed