With the processor you have got it is not ideal for the card you have TBH I would imagine their is some bottlenecking.
But one thing you should do is allocate more memory to your video card from your BIOS. It might be set to a low amount. I would set it to 256 meg!
In a big fight especialy with smoke flying around (smoke is a real FPS eater but looks so pretty) Bullets flying around players running around in front of you and also fully lightmapped maps which is very harsh on FPS will eat away at your FPS.
Compare it to RTCW and its a totaly different game FPS wise. The maps are very wide open which lead to more air strikes (more smoke) and the maps being fully lightmapped. This is totaly different to RTCW where most maps had alot of small areas and not wide open areas.
The minimum specs always make me laugh for games. Ok what is the minimum you need to make the game load up and play a 1 v 1 their will not be much action alot less to draw etc.
You are playing the game now so your system matches the minimum spec even though you may find that it does not play nice at low FPS.
But I am suprised that a “Recommended Specs” are not mention anywhere TBH.