How the hell did I miss this thread?
Both cards are supported, I had an onboard CMI8330 as well (PC-Chips boards). Apparently you can use ALSA for it, but I could never get that to work. I managed to get it to work by recompiling my kernel to include soundcard support, OSS drivers and CMI8330 as the only things in the sound section.
Some advice given to me initially, which I must admit I didn't think was particularly helpful, was to disable the onboard s/c and put in a cheap PCI s/c. Since building my new computer, I now realise that this was good advice.