Hello,I have always used my FS9 in standard configuration, my pc is Hyper Threading P4 3.0 Ghz powered. As I want to fly Meridian by Flight1 that uses Reality XP avionics, the Garmin GNS530 makes FPS terribly bad. I followed the instructions: http://www.reality-xp.com/support/knowledgebase/1006.htmAnd now I have very good framerate with that Meridian. Also, I noticed that for example PMDG virtual cockpit has such a better FPS after disabling CPU1.What are your experiences with FS9 and HT? Should I leave it so that CPU1 is disabled and only CPU0 running? Does it do more good than bad or more bad than good?

Hi,I leave my HT enabled in my BIOS and always just disable CPU1 for 'fs9.exe' after starting Flight Simulator, in case I want to fly any plane that uses the RealityXP Garmin GNS530. Other than it curing the performnce issue when using the RealityXP Garmin GNS530 I have never noticed any difference performance-wise from the sim.So to answer your question, if you are going to use the RealityXP Garmin GNS530 then it is best to disable CPU1. Otherwise it make no difference as far as I have noticed. Maybe it does make a some difference in the PMDG 737 VC and I have just never noticed it. In that case, you should always just go ahead and disable CPU1 after the sim has been started. It certainly doesn't hurt anything that I'm aware of to disable CPU1 for the fs9.exe process, so just do it.It is best if you leave HT enabled on your system though (in the BIOS) as the Windows XP (the OS) can take advantage of HT.Regards,Jim

HT makes absolutely no difference with FS (not counting the Garmin issue). The reason is that FS uses one thread for all of the processing.Until (or if) Microsoft changes the internal workings of FS to use multiple threads, HT or multi-CPU motherboards will not be of any benefit.

One special situation (other than Garmin XPS with which I have no experience) where HT does seem to make a difference IF YOU USE THE FSMETEO ADD-ON:When FSMeteo downloads METAR data, it causes a stutter even with my high-end CPU system. If I assign FSMeteo to CPU0 and FS9 to CPU1 and leave everything else assigned to whatever the system defaults them to, the stutter is eliminated.

Hi Ken,I understand what you are saying but what if you assign FS9 to one CPU and everything else to the other? Or is that exactly what happens when you assign FS9 to one CPU? I'm referring to a hyperthreading CPU, not two seperate CPU's.ThanksDavid

Thanks for replies. Everything has been nice so far. I used the tutorial there to make it so that my FS always starts powered by CPU0 only. Very useful.

The difference here is that the CPU FS runs on is now dedicated, so no other process (other than system) will run on it. This can only help the performance of FS9, though I'm not sure how much.Assigning FS9 to one CPU does NOT mean other process won't run on it. You would have to go and assign the other process to use just the other CPU. Too much work, IMHO.Hyperthread and multiCPU are the same from an application POV.