I added another 4Gb RAM to my year-old HP Slimline PC to give it a total 8Gb but it made no difference to my sluggish frame rate at all. I take it frame rate depends mostly on video ram, in which the Radeon HD 7450 has 1Gb. My system is a modest i3-2120 running at 3.3Ghz. I have a 24-inch 1920x1080 display which still looks good at 1024x768 but the "Wow" factor is missing.
Anything less than the Low Presets will reduce my frame rate to 10fps or so, which looks crappy. When everything is set low including the display I can get 20fps which is acceptable. I miss the cockpit shadows, heat and water effects, though. Anyone have any other presets or ideas that can be used to squeeze out a bit more resolution and fps other than a new PC?