I guess im wondering why the board needs extra power if the cards are not receiving any power from the PCI slots. Seems like they are just there as left overs (or an option) from before there were powered risers. Manual says they need to be connected but seems like old info.
I'm running lots of these boards, all using powered risers with no extra power to the molex connectors to the board - all running sweetly with no issues.
If you see the warning notice to power the boards from the BIOS screen, just press 'n' and ignore it.