Hi Hervé,
Yes, it's C2D U7700 version with A09 BIOS.
I've duble checked if all BIOS settings match your recomendations - unfortunetly, it didn't solve a problem
Here is the photo of panic, in case someone could get more info from stacktrace:
http://www44.zippyshare.com/v/42821077/file.html
Best regards,
Burag.