Some of those cards need an addtional power socket into the MB from the Power Supply - it is usually a 4-plug cable that is unique coming off of the power supply and it plugs into the MB.
i havent got a clue what your on abbout but ther is a 4 pin cable that i already plugged in a while back that is unique to the psu plugged into the motherboard. i have a cable with one side molex and the other side has 2 4 pin connectors, could that have anything to do with what your saying or is that just for power straight to the cards in sli mode. Can someone tell me what it is most likely to be. I did a cpuid test and i went onto the motherboard and it says that my graphics interface version is agp 3.0 and the max supported transfer rate is 8x but isnt agp a different slot all together and my graphics card wouldnt even be able to fit in if it that was the case? Please can someone help