I used to be a DFI freak, there quality has gone down hill in the last few years. I can tell you about the problem your having with the X2 showing on the second PCIe X16 slot. The board has a few PCIe slots that have to share bandwidth. (The AMD nforce 4 only had 20 total) In order to run SLI on the board with both slots a X8 there are jumpers on the board that you have to set (will be labeled on the board what pins to put them on.) This will direct lanes from the X2 and X4 PCIe slots to the second PCIe X16 slot to make it a X8
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