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.


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