hum i couldn't find out which one i was using but i gave 5.0.9 a shoot and the audio works just fine with that as well:

here is the bdmesg:
http://pastebin.com/fXQ73x4E

hum with this this the sound actually works so well that I don't need cpus-3 anymore, all 4 cores work, I'm not sure about the load in logic but this seems very promising, I guess the culprit to my issues with the sound are incorrect fsb values?
I don't know if this will help other Phenom II users but 5.0.9 seems like the best one for my setup at this moment