Sometimes but not always. Some newer motherboards have onboard sound processors that use hardware rendering, which takes the stress off the CPU. So instead of diverting 100% of the task to the CPU, it might only send 10-20%.
The quality, however, can vary depending on the brand of the integrated audio chip. Also, even some newer motherboards use software-oriented chips, which are useless in terms of CPU usage. So it just depends. Guess the answer you're looking for is maybe, maybe not!
~cdogg
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