Well, the thing is, that I have tried the OnBoard and frankly, its awful.
The sound Quality is very poor compared to my cards, and not only that, but under heavy gaming, it jitters crackles and pharts badly, and it is simply not even remotely useable.
As for a DAC then sure, I have a couple, and also I have the Creative OMNI External USB and that does a great job, however, I want to have an internal card not a USB one. I also have a couple of other USB Audio devices and also a couple of FireWire ones, but again, they are external.
I have also bought HDMI Sound adapters that rob the Audio from the HDMI Output, and for most things, its actually ok, but I am not happy with that solution either!
I keep having to reset the audio from time to time with the creative cards and its getting on my nerves now.
Its gone again and I have been using a Logitech USB device for the headphones for the moment and thats doing a great job.
I may give up and use the OMNI again, but I dont want to.
I am now 100% on Linux and for this to be the ONE thing that sets me back, then I am going to kick myself.