I also have a GTX 980, but it's running higher than 30fps for me. Did you turn off vsync in the options? Look again to make sure. Oh, and look to see if your GPU is selected, sometimes it defaults to the CPU, which could explain the lower frame rate you've been seeing.
I think the option to choose your render device in under settings. I'm not quite sure, it's been awhile since I've seen the options menu. Look around, it should be in there.
EDIT: Hmm, that's weird, I thought I remember seeing something like that in the game. I guess it was either removed, or placed in a different location.