They are to prevent too much current being pulled through the 24 pin atx connector like done here
Not sure if two GTX470's can pull that much current but I would definitely suggest using the 4 pin connectors if at all possible.
and fmsam, get a single slot pci adapter for your 2nd videocard. Throw the RAID card in the x4 slot. x4 should still easily provide enough bandwidth for 2-3 SSD's.
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