"As its name implies, EVGA nForce 790i Ultra SLI motherboard is based on the latest high-end chipset from nVidia for the Intel platform. What is new on nForce 790i compared to its predecessor, 780i, is the support for DDR3 memories and PCI Express 2.0 support generated by the chipset itself – nForce 780i was in fact an nForce 680i with an additional nForce 200 bridge chip making the conversion between PCI Express 1.0 and PCI Express 2.0. Both chipsets support 3-way SLI mode, which allows three GeForce 8800 GTX's or three GeForce 8800 Ultras to be connected together, and Quad SLI, allowing two GeForce 9800 GX2's to be connected together and enjoining four GPU's, as each GX2 is powered by two GPUs. Two of its three PCI Express x16 slots are PCI Express 2.0 and this motherboard has also two Firewire ports, optical SPDIF output and more."