it might be better to try to use a add-on sound card(pci is best due to higher bus speeds, and less latency then usb, but usb can and does work fine in most cases)
i know that when i originally tried to setup my intel 945, i tried using onboard(its been a while, but i believe that also has a realtek chip), but couldn't get it to reliably display all of the outputs all the time in the audio processing software...
here is where the issue comes in though-- the atom processor cannot go above 30-35% usage without causing some really nasty audio dropouts-- this was the entire reason that my 945 got removed, and replaced with a zotac 9300/pentium setup..
so if you decide to use audio processing, you need to be very picky about what plugins you use-- some of them are more cpu intensive then others..
audiomulch includes some very nice, small plugins that seem to work very well at very low processor requirements-- i run 2 instances of their mono line level adjustment, and don't believe that it affected the overall cpu % much at all..
a quick note about console and audiomulch-- i have tried both, and i really like audiomulch better.. the reason is that it includes a bunch of plugins(like the level control i listed-- and i still have not found anywhere else that offers a level control plugin), and the overall layout structure allows me to feel more in control of what is going on.. console is a great program for the price, but lacks certain features that might become more critical once you start to get more involved with what you need to do with your setup..