Having just upgraded my soundcard from a Audigy 2 to Audigy 2 ZS my FS2004 now plays at less than 1 fps, before it was in the 50's.
I have reinstalled the game and all drivers, patched it, updated it etc and its still the same, If I remove the card then the game plays fine. Any ideas ?
Sound uses up more memory than you think.
Try shutting in off in the sim's settings and see if that works.
Did you clean out the old cards drivers before you installed the new card and it's drivers.
yes i did all that but I have now found the cause. I use a midi adaptor lead plugged into the joystick interface for connecting a midi music keyboard and the joystick, when i plug the joystick into the soundcard direct it works fine !
I use this adaptor with other flightsims and it causes no problems, only audidgy 2zs and fs2004.
At least you found the cause, now you can enjoy the sim.
Thanks for letting us know, it may help someone else sometime.