It’s wholly possible that this is a non-story but it sure sounds good in creating outrage.
The review sample has a different (older) BIOS from the retail sample. This could mean many things: different tuning parameters, OC mode may be enabled by default, or something else that would be different in a later revision. Not to create better looking benchmarks, but because that’s what happens when you’re developing new hardware and drivers. It’s not like they juiced the review units with more cores or faster RAM. Doing the math, the difference is a paltry <1% in speeds.
Also understand this is not an integrated graphics card sitting in your grandma’s Gateway 2000. This is a $700 card that will be used only by serious gamers and PC enthusiasts. The kind of people that know their way around overclocking and PC tuning.