Well, CLEARLY, if someone on teh intarw3b said it, it must be true!
It's quite possible that many of the 6800 cards *are* being produced in the same place -- this is nothing new (for instance, Sapphire produces, or at least used to produce, most of the "Built By ATI" R300 cards.) However, I haven't seen anything to indicate that *NVIDIA* is actually producing them (as opposed to a third party manufacturer), or that they are actually all built with identical hardware.