I have an AMD 6000 with XP Home and have both graphs showing and displaying both CPUs running up the scale with FSX. How on earth do these "Old wives tales" start. John

Well, not really compared to some other FlyTendos out there. :-) An AMD64 X2 4600 with a glorious 2% overclock! :-) Kind regards Jaap

Sorry about that,Maybe its old info. I still remember we had to upgrade a NT4 server from single to dual core. It took a full reinstall because dual core support needed a different HAL. We did a little trick and switch HAL's on the already installed system.I am 100% sure an installed single core NT4 setup needed a new HAL before the 2nd core could be used.In theory you could place your old single core installed WindowsXP install HDD into your new box and after a few driver upgrades the OS will work. But in that case the XP equivalent of the old NT4 HAL wil be the single core version. There has to be a reason why the OP only sees 1 processor graph.

Hi, I agree...I find that watching the fps numbers is a bit of a waste for me and my dual core.After I updated to SP1 I find the overall feel of FSX to be much better. It's much smoother regardless of the fps #. In some cases a high fps isn't smooth while in others a low fps is smooth as butter. In any case. SP 1 has tremendously smoothed out panning in VC. Amazing difference in my case. I don't turn the fps n anymore....

Here is a new twist to this aspect of tuning.I took a flight from KPIE to KTLH. At height my FPS settled down in the range 15-22. During the flight my TrackIR and ASV 6.5 were active.Having looked at the CPU usage graphs and using a bit of a hunch I set the FSX affinity to CPU 1 and the trackir and ASV affinity to CPU 0 where they could compete with the backgound processes.I then reflew the flight with no FSX changes except the Config Affinity mask.My FPS jumped to the range 28-37 with what appeared to be less variance than the previous flight (I am locked at 40FPS). I estimate that my overall FPS increase was over 50%.I am sure this is not an answer to everbody's performance issues but you can always revert back if you want to try it.John - Happy Chappy :-)AMD 60002GBs Corsair DDR2 4001 x Nvidia 8800GTX (16Q AA assisting) (looks beautiful)