I believe that 6 pin connector comes from the power supply not the motherboard (if that's what you meant by mbo). Your power supply has 2 PCI-E connectors which is good for more demanding video cards and the including one. On a side note I do not think that motherboard supports crossfire/sli since you only have 1 PCI-E x16 slot.
My mistake. I keep forgetting I downgraded the Motherboard from another one. Thank you for the reply, I feel reassured now about the 6 pin connector, you are correct.