ahh! the higher i overclock the CPU, the less sound i get!

ok it's very weird, when I OC my 2.66 CPU it can get high yes, but when I go into games or listen to winamp the sound just goes out randomly and doesn't come back for another minute or so, only for a few seconds. Is there something wrong the onboard audio of my Abit BG-7? I ordered an SB Live 5.1 PCI card, would that help out the problem I have with the sound going out? I mean overclocking that high really only seems to affect the sound and nothing more.