You can stick a sound card in there and tell the onboard sound card to shut up in the BIOS. I had to do this on my comp a year or so ago and it's been fine since. You probably don't have to tell the on board sound to shut up, just don't connect any speakers to it. It's possible the computer benefits slightly from not having to generate every sound twice.

Asking a course 6 to answer this question is like asking you to help with my taxes or asking me to help fix your car.