Over time tweaking and adjusting I have seen dramatic changes in the performance of FSX. Given all that I was doing I never put together any correlations. Recently I had to re-install FSX. I tried it with the stock FSX.CFG file. and had 40 to 50 FPS. The settings were:Cpu (dual core e4400) overclocked to 2.4ghz from 2.0ghz4gb DDR3 memorynVidia GTX-240 512mbAsRock motherboard (aka mobo)Windows7 32bitFSX:All sliders to right except that no AI traffic of any kind.FPS over rural Northeast USA 40 to 50 fps using Carenado C152 at 80knots in slew mode.I changed cpu speed from 2.4ghz to 2.3ghz and FPS dropped to 15 to 17 - stutter and flashingReturned to 2.4ghz and fps went to 40 to 50 same flight.Then tried 2.39 ghz and fps went to 8 to 10 - stutters and flashingThis seemed quite weird. Obviously the speed numbers vs. fps are not rational in common sense terms.However, I am guessing that there is a noisy bus due to the usual cheap capacitors used today. Thusthe sampling of pulses on that bus could be impaired by added noise or harmonics. Small frequency changeswould move the nasty stuff out of the timing window of a gate and thus the odd performance.Obviously there could be other factors such as self-resonance or harmonic relationships. Or,there is some odd set of code in FSX that adversely reacts to CPU speed. Mystery This could all be confined to the particular motherboard I have or it may be an explanation ofother strange events with FSX in a broader context. I just toss it out as either an isolated (to me) incident or something more sinister .

Over time tweaking and adjusting I have seen dramatic changes in the performance of FSX. Given all that I was doing I never put together any correlations. Recently I had to re-install FSX. I tried it with the stock FSX.CFG file. and had 40 to 50 FPS. The settings were:Cpu (dual core e4400) overclocked to 2.4ghz from 2.0ghz4gb DDR3 memorynVidia GTX-240 512mbAsRock motherboard (aka mobo)Windows7 32bitFSX:All sliders to right except that no AI traffic of any kind.FPS over rural Northeast USA 40 to 50 fps using Carenado C152 at 80knots in slew mode.I changed cpu speed from 2.4ghz to 2.3ghz and FPS dropped to 15 to 17 - stutter and flashingReturned to 2.4ghz and fps went to 40 to 50 same flight.Then tried 2.39 ghz and fps went to 8 to 10 - stutters and flashingThis seemed quite weird. Obviously the speed numbers vs. fps are not rational in common sense terms.However, I am guessing that there is a noisy bus due to the usual cheap capacitors used today. Thusthe sampling of pulses on that bus could be impaired by added noise or harmonics. Small frequency changeswould move the nasty stuff out of the timing window of a gate and thus the odd performance.Obviously there could be other factors such as self-resonance or harmonic relationships. Or,there is some odd set of code in FSX that adversely reacts to CPU speed. Mystery This could all be confined to the particular motherboard I have or it may be an explanation ofother strange events with FSX in a broader context. I just toss it out as either an isolated (to me) incident or something more sinister .

This is possible. Data is moved through a computer on what's called a Bus. Sometimes there are timing issues that can cause the bus to get clogged up, significantly affecting performance, increasing the speed of the CPU to that level may just be fast enough to prevent this from happening freeing up the data pathways.