It depends on the programs that you wish to apply. (competitiveness, ranking, their requirements) But many schools are eliminating GRE requirements though.
If the school that you want to apply still wants the GRE, 310+ would be more of a safe range, in my opinion, in order to secure the funding.
However, I think they'll consider other aspects of your application as well (GPA, references, experiences, SOP, etc).
Good luck on your application!