Compared to the other SLI models, the 650i SLI is surely missing out on a lot of things, though none of them seem to have a real impact on performance.
Boards equipped with the nForce 650i SLI does not have the 1333MHz FSB support (at least for now), EPP memory support, 28 PCI Express bus lanes, two SATA ports, two USB ports and one Gigabit LAN port.
Most users might not pay enough attention to the missing ports, and at least some will ignore the lack of official 1333MHz FSB and EPP memory support, but the 28 missing PCI Express bus lanes really does matter.
To be continued…