had some issues in my usual testing machine, so switched to my gaming beast( w7 ultimate 64 bit i7 930 oc 4ghz 12gb dd3 2ghz ati 5850)
started a new game played to oom(first time 1.45gb ram usage by elemental as reported by taskmanager, zip created, added saves & dxdiags
reloaded game and continued playing to second oom at 1.40gb ram usage reported by taskmanager, zip created, added saves & dxdiags
during the game I noticed that several tactical battles looked like they were happening on the strat map based upon the size of trees and other props like farms
eg

harpo