T-Break published a review on the MSI NX7950GX2 Video Card

While the 7950 is technically a single card in the sense that it only requires one PCI-E slot to work, it is made up of two GPUs connected via a custom developed PCI Express switch by nVidia that directs the bidirectional PCI Express connection from the system to both GPUs. You don't need an SLI certified motherboard for it and it'll work with almost any modern chipset board supporting PCI-E.

MSI NX7950GX2 Video Card Review