To further quantify the results to date I'm running Intel Core 2 Duo E8500 (2x3.16GHz) 1333 on a ASUS-P5QC skt 775 mb. GPU 512mb Nvidea GF 9800 GTX+ RAM 4Gb Corsair DDR3 1600MHz. Audio Creative X-Fi Xtreme audio 7.1.
OS WinXP Home SP3. I run settings shadows 50%, AA default off, forest animations 50%, (grass moves but trees don't!). All else 100%.
My FPS vary sometimes (i.e.drops) with no apparent cause but in general follow the action/fps impact as expected. I find this is a resourse hungry sim and like other members I run IL2, Karkov1942, Flashpoint DR with no real visual problems. I have had FPS down to 4 but this is transitory but has happened.
All the best - Mort