thanks for your intervention , I have read that article but , as I say , I'm not so sure if in this moment the signal is HD because AC97 front panel header's pin 4 is not stuffed (is missing) http://communities.intel.com/message/61731#61731 .
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motherboard signal is HD but front panel needs to be designed as per HD specification. see front panel design guide here http://www.formfactors.org/developer/specs/A2928604-005.pdf section 2.3
Good thanks , I thought that if the pin 4 is missing on header there is no chance to receive HD signal.That means (imho) if I am able to hear through the AC97 front panel header , the sound should be HD - right ? ( i'm not sure if you see but actually my real problem is that pin 4 ).
Just let me know if this should be the final answer
All the best