so here's the rmaa test, actually two tests, both tests were conducted using the headphone out as signal source, and the first test used the mic-in as recording device, while the second test used the line-in as recording.
So it has better specs than my creative x-fi xtreme gamer, but lets analyse these results a little. We can see that altough the mic-in has a little more noise, it has better (lower) harmonic distortion.
For some subjective listening experience: I own a Sennheiser HD485 set of headphones, and it drives theme to extinction... :) really, if i let the volume at 100% for 15 minutes my headphones start smelling like roasted duck. The output current capability of this soundcard is great. And while playing at 100% volume, there is no distortion in the headphones...
All tests were conducted at 24 bit 96 KHz settings in creative console, and i use foobar2000 for playing flac files with resampler activated and set to 96KHz ultra mode.