problem with DFI infinity 875

I was wondering if anyone has been having problems with the sound on the infinity board after overclocking and also if anyone can tell me if you are able to adjust the multiplier or raise the fsb above 132mhz. My system : a dfi infinity 875 mobo with a pentium 4 1.8ghz 400fsb memory 3x250 ddr2100 graphicscard is a nvida mx4200 64 mb windows xp

loosing onboard sound is a common problem on all boards when the overclock is too high