What other games do you have besides BF2? Anything that might stress your CPU/GPU as much? Tomb raider is NOWHERE NEAR as stressful on higher end cards than BF2 is. Do you have battlefield? Or dishonored? Or crysis?
Intel has an extreme tuning utility that acts as a stress test (not sure what your processor is, but it might work with anything). 3dmark works (i think this costs money to stress test though), unigine heaven works (free), and pcmark (which may also cost). Try one of these. Unigine for example and let it run for a while. Make sure you monitor the card usage levels because you want to stress the entire system.
