I figure that we see lots of Realtek updates because they use a unified driver for each class of sound chip.
Some updates may only add or fix features with certain chips.
You raise probably the most important difference between a card and a chip on the MoBo.
Isolation on a daughter-board means that you are less likely to suffer with random crackles and buzzing.
If a user has a mixed setup, what do you think ?
Feed the onboard chip from the cleaner output of the card ?
I am guessing you would be less likely to amplify any buzzing the you may get on the MoBo chip.
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