What kind of fps should I be getting?

[Xanek]

My Computer is comprised of:

• EVGA GTX 760 SC (Super Clocked)
• i5-3570k @ 4.1 ghz (Boost)
• 12 GB of Ram (2x2GB + 2x4GB)
• ASUS P8Z77-V Motherboard

I currently get 40-60 fps in medium/large battles w/ High Graphics & High Texture, but everything else low/off
With Ultra Preset settings w/ no PhysX, I got 30-43 fps in a medium sized battle.

There are two videos on youtube, one with a GTX 760 + i5-3570k 16gb ram getting around 50-70 fps during a medium sized battle, where I would usually get 45~55 fps w/ the first described settings above,

and there is another video where someone is using a GTX 660ti + i7 3770k getting 55-60 fps on average w/ physx turned on in small/medium battles.

I am wondering if it might be a problem with my computer components or something else.