The only thing I can find in the 6600 iteration is either an AGP card or PCI-Express. I haven't found one in PCI-Standard either. My first thought would be either that it is an AGP card, or like Tiny says it has a "6600" name for some other reason. I would also agree with ED, that if it is a true 6600 series it very well could require another power source plugged into the end of the card. So if you are sure it doesn't require that, then it would lend itself to the fact it might not be a true 6600 series.
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