I wouldn't have guessed power supply off hand, but if you are getting FPS issues at the same time as sound issues then I would definitely suspect power issues (since you have already tried 2 different sound options).
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Desktop: X3 710, 4GB DDR2 1066, MSI Cyclone GTX 460, Seasonic S12II 500W
Away from home light Gamer: Acer Aspire 15.6", A8-3500m, 4GB 1333
Internet/General Use: Lenovo B570 15.6", i3 2330m, 4gb 1066mhz
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