Hey there Phil, here's the deal. With your current setup, you should probably be able to see everything...it is just that your frame rates will probably be shot to hell. If you just want to take screenshots to post on the net or to keep, then you should have no problem. A better graphics card will improve the clarity and sharpness and give an all around nicer appearence, but you still may not get the best experience with the speed. BTW, it your 900mhz a Pentium™, AMD™ or Celeron™?
I hear that Celeron chipsets (typically below 1.2ghz) do not handle graphics all that well. Pump up all your settings then go to KORD and see what you think. If the screen is too choppy, lower your settings one by one to find a spot that will make you happy.
Good Luck.

P.S. Found the scenery....actually had it installed already and forgot about it. Leaves alot to be desired!
At least something is something.