Sound card...Is it worth it?

I was doing some reading on how to tweak FS2002 to its best performance. It mentioned the having a sepirate PCI sound card should help the speed quite a bit. Dont know if its true. I did what it mentioned and disabled the sound during flight. i noticed a medium sized improvement. It ran a bit smoother and didnt jump as much + a 2-3 fps increase on the ground. Would getting a sound card increase this more or is it even worth the trouble to get one. I think i have seen them for about $20.
Also if anyone knows of better info then the one i found on avsim about tweaking please post. Also says to disable some of whats running in the background. I never know what all of that is other then a couple main programs i shut down anyway. I know with this set up i should be getting much more then i am. Though at some point looking to get a newer system. Just need about $400 and the few parts from my older systems to have a custom built. Dont know if that will ever happen though. There is a nice HP we found for 500 that with my graphics card and extra ram chips it would run like a dream.
Also if anyone knows of better info then the one i found on avsim about tweaking please post. Also says to disable some of whats running in the background. I never know what all of that is other then a couple main programs i shut down anyway. I know with this set up i should be getting much more then i am. Though at some point looking to get a newer system. Just need about $400 and the few parts from my older systems to have a custom built. Dont know if that will ever happen though. There is a nice HP we found for 500 that with my graphics card and extra ram chips it would run like a dream.