Gigabyte GA-8N-SLI Quad Royal Motherboard
 

The Gigabyte GA-8N-SLI Quad Royal is the first motherboard ever to feature four physical PCI Express x16 slots. This very special motherboard is based on the nVidia nForce SLI Intel Edition chipset, and as such supports Socket 775 Intel Pentium processors. The board actually has two nForce4 SLI chipsets PCB, the Intel (Northbridge) and AMD (Southbridge) edition work in tandem to support all four PCI Express x16 slots, and this is what makes the GA-8N-SLI Quad Royal feasible