Asus A8N-SLI Deluxe questions

[uOpt]

A few questions on that one:

1) will this board support four double-sided RAM modules at 2x400MHz?

2) I assume the first gigabit ethernet is NVidia's in-chipset solution, not on PCI?

3) The second gigabit ethernet appears to be PCI, not PCIe, so it will pick a fight with the IDE controllers. Correct?

4) If I have "only" one PCIe x16 video card, can I use the second wide slot as a PCIe x1 slot (for a total of 1x PCIe x16, 3x PCIe x1, 3x PCI)?

Thanks