When there are such significant performance differences, yes they should - evident by the fact everyone else was up to scratch.
The furore surrounding the inclusion of a O/C'd GTX 460 is beyond me TBH. These are cards that are known to O/C and is somewhat a feature, not to mention the prices of O/C'd models now being consistent with stock 6850 (add to this the fact reviews OC'd 68xx cards) prices.