I'm using:
i7 3930K (stock speed)
Sabertooth X79 (Asus)
GTX 670 4GB, Superclocked (EVGA)
32GB DDR3 1600Mhz CL8 (Corsair Vengeance)
2x OCZ Vertex 3, 120GB SSDs in Raid 0.

I'm using DX9.