Battlefield 3 Low Fps

I have been getting low fps on Bf3. Here are the specs

CPU: I5 3570k @ 3.4 GHz
Mobo: Asrock z77 extreme 4
GPU: Radeon 6670 1gb ddr3
RAM: G skill 8 GB
PSU: tx 750
Storage: Western Digital Caviar Blue 1 TB

All of these resolutions are tried in the lowest settings possible.
At 1080p and the lowest possible settings i get 15-20 fps. This is understandable. So then I tried going into windowed mode, and had the game on 1/4 of the screen. It was around 25-30 fps. Also understandable.

So then, since I wanted the most frame rate. I went into 720p full screen, it was also around 25-30 fps. So then went into windowed mode in 720p and I still got at max 29-31 fps. Since this is the case, I am wondering if I have a bottleneck in my system.

Any idea on what is the problem here?

Also when i go into steam big picture mode, it detects the on board graphics instead of the 6670. Is this normal?

My original plan was to get a cheap GPU and upgrade it later.
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More about battlefield
  1. You need to get your amd drivers, and make sure you are fully on dedicated graphics, not integrated. Download gpu Z to make sure which GPU you are using
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