Wow, some people here don't know much about electrical engineering huh.
Wrekage, that post wasn't for you, it was for copenhagen69 who asked how the other member knew the extra 2 pins where ground wires.
Apopin, Im sure you know a ground wire can't provide more current, those are basics. Even in your last post, you quoted someone saying it was just for reduced resistance. So a 6pin can provide as much power as an 8pin, it would just get hotter.
AMD added it just so they could comply with PCI-E specs, as the card is rated for 250W with powertune set to +20%.
When GTX570s are overclocked to be as fast as 580s and use as much, if not more power, I don't here people going "oh, it going to fail cause it doesn't have an 8pin". It fails for
other reasons.
Your PCI-E cables would melt long before a 6950/570 fails from using a 6pin instead of an 8pin.
Now that I think about it, how on earth will a card fail if it isn't getting enough power? Thats just moronic reasoning.