[LAD] A little quiz about audio measurements...

[Veronica Merryfield]

Just thinking about what I had wrote and remembered the semantics used here...

> One more hint: card X is a very high end one. It should
> be 'perfect', or at least much better than card A.

... which might suggest that Card X is not performing well. Since it has been stated the card x is not USB, it is possible that this card has it's audio clock derived from the PC clock which is likely dithered - they call it spread spectrum to help reduce radiated noise in testing.