8-pin internal power supply cable

I bought from ebay a video capture card Matrox RTX2. However I get the messege, "The setup cannot continue because your Mastrox RTX2 hardware cannot be detected, please make sure that you have correctly installed your RTX2 hardware before running RTX2.utils setup again." The installation manual shows an 8-pin INTERNAL POWER SUPPLY CABLE which i don't have. Where do i get this kind of connector and do I need a separate power supply unit? Thanks
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More about internal power supply cable
  1. I am guessing the 8pin or the 6+2 PCIe connectors from here http://www.playtool.com/pages/psuconnectors/connectors.html
    If you do not have one on your PSU then here is an adapter if you already have a 6pin PCIe http://www.newegg.com/Product/Product.aspx?Item=N82E16812198016
  2. If you don't have a 6 pin to use to get an adapter for an eight pin then you can get this;

  3. Although the manual says 8-pin internal supply, I see 7-pin in two rows? Does this mean a 14-pin? Is there a 7-pin?
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