Is your computer a pre-built machine?
Sounds like you may be using integrated graphics instead or display's refresh rate hasn't been set correctly and Vsync is holding fps in accordance to the refresh rate which may be set to 30Hz.
First check video port connection at the back of the case is connected to the 2070 which'll be further down the case. Usually there are multiple video ports, the upper ports use the CPUs igpu.
Check Hz is set to the optimal range for the monitor in NvidiaCP resolution. Are you using a monitor or Tv? Usually PC's auto detect monitors correctly but sometimes not for TV's.