I do have a 965-DQ6 (first Gigabyte Mobo I own) and I see that it has her own SATA 2 controller.
Is there any performance improvement using this SATA connectors instead of those linked to the Southbridge chipset (ICH8R)?
no all the ports are the same. DQ6 is a great board. and yeah he is right there are 6 thru southbridge and 2 more through another controller that also controlls the PATA since the ICH8 dosent have PATA support.