If you grab an Intel Lynnfield processor and a matching P55 motherboard when they come out (likely September), you may be able to run GeForce graphics cards in tandem without issue. That's because Nvidia has licensed its SLI technology to Asus, eVGA, Gigabyte, Intel, and MSI for use in P55 mobos specifically.

Nvidia explains, "Customers who purchase a validated P55-based motherboard and Core i7 or Core i5 processor when available can equip their PCs with any combination of NVIDIA® GeForce® GPUs, including Quad SLI."

http://techreport.com/discussions.x/17383