AMD cuts to the core with 'Bulldozer' Opterons

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On a side note point me out to the new CPU architecture that was 2x faster than it's predecessor at the launch?

You have misunderstood what I said. Core for core, obviously you can't expect double IPC with a new microarchitecture.

The article said that two Bulldozer cores have a 1.8x increase in parallel performance over a single current generation core.

That is where I got the number of 2.0x, comparing two cores to one core.

Now if we divide that 180% boost by two, we can roughly determine the performance of a single Bulldozer core vs a current generation core. It works out to only 90% of the performance of a current generation core, or 10% slower, which happens to be exactly what the article said.