Set 'vertical sync' to always on for Aces High II. If you are getting frame rates higher than the video refresh you are asking for troble in Aces High II. If you have an LCD panel, the frame rates shoul dnever exceed 60, unless you have a new 120Hz LCD panel, then the frame rates should never exceed 120.Getting higher frame rates thant he vertical refresh is going to have negative effects while playing the game.If I turn off vertical sync on my system, I can get over 300FPS using a 7600GT video card. A 3.2Ghz Core 2 CPU is what drives that.