Samitheman :
Well my resolution is 1366x768 720p... so fps?
If you find the chart with 1680x1050 at Low preset you'll see that your setup gets 50fps. Now, if you dropped down to 1366x768 at Low...I'd guess 65fps. So, you could go to Medium and get around 45-50fps. (guess)
So, I'd say BF4 on Medium with 30fps. (mind you it's a guess cuz game isn't out yet but you can guess it will be more GPU intensive) Your setup is ok, but I'd wait until you try the game out then decide if you want to upgrade your GPU.
Btw, use FRAPS to record gameplay or to find out your fps.
http://www.fraps.com/