PC hardware surpass recommended but still low FPS

[DarkStaoneDragon]

My Wife just upgraded her GPU her graphics is improved but still has a 30-40 FPS range at max settings the new card is a nvidia GTX 750 ti when she runs it looks like she's rubber banding, we are wondering if it could be an issue with our internet, her power supply is 460w so it can handle the card, any idea what could be the problem could be? do we need a different card that would run the game at max settings with 60+ FPS without changing the power supply?

edit; forgot to add that the directx was upgraded to 11 not sure if that would effect it any.
PC specs
CPU: i7 3770 3.40
RAM: 12GB
Vid Card: nvidia GTX 750 ti
OS: Windows 8 (went back to 8.0 after upgrading to 8.1 due to issues, but thats before the new card)

and all drivers updated today