If you unmount the cooler of a reference card, you could notice an obvious abrasion over the corner of the inner 6/8-pin power connector socket. No, it ain't by chance you've got a bad pick. It's common among all the popular review sites.
Yes, it's because if you don't polish that corner, you wouldn't be able to mount and install that cooler! Thus AMD spent a delay to fix that - they polish every card by hand, therefore each card is guaranteed to be a hand-crafted unique version!
http://www.xtremesystems.org/forums/sho ... p?t=263668