Nvidia control panel > 3d settings > manage 3d settings > power management mode
By default its always set to Optimal power. You want to change it to 'Prefer maximum performance'. This will uncap the performance potential.
Also under Configure surround > Physx you want to make sure your GPU (GTX980M) is set as the default Physx processor. Lastly, make sure G-Sync is enabled (Make sure its ticked under the G-Sync tab).
These will make a considerable difference.