Easy, tiger. The kid is just making a simple interpretation of happens to be somewhat true. Though AMD's higher cache(well that was the case with the Athlond XPs compared to the Celerons at the time), shorter pipeline, and integrated memory controller are not necessarily made for gaming, but they do handle it better, and until FX60 came about, Intel was better at media applications primarily because of the deep pipeline. So be nice to the new member, please.
On the issue at hand, you would definitely see some improvement by moving to a faster CPU, whether Intel or AMD, but as suggested earlier, the control panel seems to be your best(cheapest) option, or increase your resolution and decrease AA/AF which should decrease the dependancy on your CPU, since your GPU is rather high end, while your CPU is mid range.