The areas for core, surrounding controllers and l2 cache had the same proportions like on a 130nm core. I'm sure everyone would notice a difference after seeing lots of 130nm Opteron wafers. And it's even easier to see when a Barton wafer lies next to it and the "unidentified" dies are ca. 20% bigger.
a bit like ##### ##### ##### ##### ##### (Barton)
vs
###### ###### ###### ###### ###### ("unidentified" die with structures like Opteron)
OTOH a Barton and an Opteron die (both 130nm) on their package (some of the engineering samples didn't have heat spreaders) are a big difference.
BTW I wasn't there alone. A friend saw all that too, but he is more a graphician than interested in hardware details ;)
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