Axiom Home Page Forums General Discussion Technical Questions Sound Card's SNR?

There's no SNR with a digital connection. You could use the onboard S/PDIF output (if it has one), and you'll get exactly the same audio.

And it isn't only 100 dB SNR, that's far in excess of what you could ever hear in a normal listening room, where the noise floor of the environment is greater than 30 dB.