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When I had Windows 7 I had to limit the available RAM to 3GB maximum or I'd get crackling sound whenever a sound tried to play. Something to do with the drivers for the Creative X-Fi sound card.

Now that I've changed over to Ubuntu the sound has started crackling again.

Mightn't there be a way to limit the available RAM like I had to on Win7? Or I have to buy a new sound card?

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You can control this with kernel parameters. If you follow the prompt to edit your Grub menu items when you first boot you can add parameters.

http://www.cyberciti.biz/howto/question/static/linux-kernel-parameters.php

The mem and max_addr parameters would seem to be the most relevant.

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