Yes you need two slots (seems like a well ... duh question, but anywhoo.....).
Yes, CK8-04 is supposed to come with 3 versions, Ultra and SLI which both should support dual PCIe, and the generic/non-ultra/whatever which will just have 1 PCIe. nV is expected to call them Nforce4, but even that is becoming an issue with the different version, they may move to a wider variety of names and numbers.
And if it only has one slot, whats the point of waiting for pci-e if i can't run two cards in sli
Because future cards will primarily be PCIe, and who knows what kind of resources they will take advanatage of.
But no one says you NEED PCIe, however you may want it. But even that depends on what you have to spend and what you are doing.
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