There are two versions of 8-pin connectors and the older ones are INCORRECT. You can also make a 8-pin connector from two 6-pin connectors with adapter. Because the next gen graphic cards will use these new connectors I recommend buying a PSU that has 8-pin pci-e connectors if you are looking for a new PSU.
"In the above photo is the frequently used, INCORRECT 8-pin PCI-e connector. The one on the right is correct. Note the bottom row. The last pin has a "D" shaped housing on the correct connector."
"The old 6-pin can fit into an 8-pin socket, but what this will do to performance has yet to be confirmed. Rumors speculate everything from the video card "dumbing down" to a lower clock to simply disabling the ability to overclock the cards."
http://www.jonnyguru.com/forums/showthread.php?t=1220
"In the above photo is the frequently used, INCORRECT 8-pin PCI-e connector. The one on the right is correct. Note the bottom row. The last pin has a "D" shaped housing on the correct connector."
"The old 6-pin can fit into an 8-pin socket, but what this will do to performance has yet to be confirmed. Rumors speculate everything from the video card "dumbing down" to a lower clock to simply disabling the ability to overclock the cards."
http://www.jonnyguru.com/forums/showthread.php?t=1220
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