Yep your right it shows Dual channel in every slot permutation, maybe that's why they call it the Quad
But my benches show a better performance in normal Dual channel (matched coloured slots), which is what i expected. Performance loss running non-dual is around 2.3% which is probably lower than expected. Have not had chance yet to try 1:1.25 but if it makes that stable then a 2..3% loss might well be worth it to get the extra Mhz. I think that it's usually been said that dual channel is worth 5%.
All shots are based on 450x8 @1:1.20 1080Mhz.
I tried clearing
cmos to see if it was perhaps a DMI update thing but it still showed dual channel
Normal Dual Channel
Inside Sockets
Outside Sockets