duel core may help FSX.

Hi allI have just tested a theory I had about X2 or crossfire,In task managerunder performance I have Two graphs one for each of my two cpu cores. While typeing this the cpu usage is about the same on both graphs and the cpu usage at 1 to 2%.When I load FSX The cpu useage jumps to 51%the first graph chart is max,the second shows slight usage When I start my AV there is a big hit on the second core the graph shoots up about 75% of the graph and drops back imedeatly and continues with usage at 51 to 52% the same happens when I turn the AV off.My question to our experts is could the second core be accepting the hits from other programs and saveing FSX.because I dont stop anything on my PC while I am running FSX.and I dont seem to get the problems some of our friends are haveing.My CPU is AMD64X2-4800.All the BestRex:-wave