When I have 5 fps, my cpu usage is only 35-85% fluctuating! service pack 2 is installed so all 4 cores are working at the same time. My RAM is 4GB. So whats left is the video card. Does it mean my video card is not keeping apace with the cps so it slows down the cpu? the card is nVidia 9400 GT 512 mb..... what do you think the bottle neck is? and if its the card then what video card is the best out there for FSX?