Wow did I ever find an interesting article from a month and a half ago. I always figured that the 680i chipset was the only way to go with SLI 8 series cards becuase of the bandwidth limit on the 650i. I knew that PCI-E has tons of badnwidth left though, but still had no idea how much the 650i really gives.
Boy was I wrong in thinking that the 680i was the only good option becuase according to this article done by the very trusted TechSpot.
Nvidia nForce 650i SLI vs. nForce 680i SLI - TechSpot
The 650i for half the price on average, actually offers BETTER performance on average with SLI 8800GTX's. I have always hated the 680i becuase of their bugs and the insane price. The overclocking options on the 680i are a little better than the 650i on average but that doesn't mean you cant hit very high speed on your C2D either.
Going by this article No one in their right mind should even consider a 680i as the 650i handles the most powerful cards in SLi with ease, actually better in some cases.
Anyone thinking of a 680i becuase they look great, DON'T. Just get an MSI P6N 650i or an Asus P5N 650i instead and use your cash for more gaming gear
If anyone already knew this already, lol then deal with it as I didn't and I doubt too many others did unless they were following the boards.