Power requirements- power supply question

Alright guys, I have a gigabyte 990fxa-ud3. It has 2 pci16 slots 2 4x slots and 2 1x slots. Someone told me that 1x slots will still work with mining? Litecoin specifically. Are there any other speculations other than power that would stop me from running 6 cards? Can it still be done in windows or is Linux a must? My goal would be to get 6 cards on this board, I'll use the extender cables with powered molex attached. Anyone see any problems with this?

Second can I run dual power supply's on one system? Rather than shelling out for a 1300+ watt power supply? I have a decent 80plus bronze GX650 right now, if I snagged one more of these I think I could run 6 5830's. my main question is how to wire that in? Wire the remote on the motherboard to the second power supply? Or just jump it permanently?

Any feedback appreciated. Thanks guys!