When I get home, I'll dig up my specs.
I forgot to turn on self shadows for this little city tour. This was in EW, and I was the only one over our city. My Fraps forces the FPS to 30 for recording (to save room and processor overhead), but I normally am locked at 60fps without shadows. With shadows it's about 45-50. All the rest of my graphics settings are maxxed out and I fly at 1900x1200 on a 24" widescreen.