I'm having very hard time trying to make my sas controller work on Extreme4.
It seems, that the second long pcie slot is intended only for graphic cards. If you put literally anything other in this slot it becomes undetectable. ROM is not executed, the card is non existent.
The third long pcie slot is supposed to work with 4x but I am not able to get 4x speed with my Highpoint 2640x4 controller. The device is fortunately visible but works only in 1x which gives me around 170MB/s sequential transfer rate, It is 30% of my array capabilities.
I ordered Asus P8Z68 Pro. Lets see what this boy can.