MSI X79A-GD65 (8D) PCI-Express 3.0 Problem

Hi everyone.
 Currently, I'm using Intel Xeon E5-1607 with MSI X79A-GD65 (8D) and recently I got a Intel Xeon E5-4S Engineering sample CPU (QAFF). (Xeon E5-4S CPU)

 With E5-1607, My FirePro W7000 works really well. But with new QAFF ES CPU, my PC won't...