Nothing is wrong with that score. If you ran it a while ago with the 570 and had a similar score, you have to know that 3Dmark Vantage (I'm assuming you mean vantage by the score you expected) has changed their default settings to not use GPU accelerated PhysX. Since the change, you can expect about a 4-5K lower score.
With AMD, you never had the option to have GPU accelerated PhysX, so again, you'd see the score you have. You could improve the score quite a bit with an OC'ed CPU/GPU.