With that system you should be able to run just about any detail settings you want. I've got an FX-62 (overclocked equivalent, anyway), 2GB of RAM, and an X1900XTX, so my core rig is a little slower than yours with a bit better graphics card -- and I'm able to run EB at 1600x1200x32, all details maxed, and grass distance manually set to 300. Frickin' gorgeous. The only slowdowns come about with time accelerated and two fullstack armies on screen.