K10 is shorter pipeline design and there is no guarantee whatsoever that on 32nm it can clock higher than Bulldozer. Bulldozer on the other hand was designed with 30% more clock target and pipeline was completely redesigned in order to achieve this goal. AMD will fix the power draw issues in time ,maybe with PD or maybe even with the next stepping (C0 8150/8170?) and they will be able to scale up this core to MUCH higher clock speeds with smaller nodes (think 28nm and lower). K10 started at 2.3GHz @ 65nm at first and ended up at 3.7Ghz @45nm. Keep in mind that K10 was not designed with high clock speed in mind,while Bulldozer is. So if K10 hit 3.7Ghz on mature 45nm node, Bulldozer++ on 28nm node should be able to hit much higher than 4Ghz and stay within 125/95W brackets. Couple this with core(IPC) and uncore improvements and AMD is set for next 4 years,maybe even more ,when it comes to competing with the giant intel.

Another interesting thing is Zambezi's Linux performance. This is what I posted in News section thread:
How is 8150 performing under Linux in Phronix test suite? This is what Michael Larabel @ Phoronix posted yesterday (thanks to dresdenboy's blog):
Posted by Michael Larabel on October 14, 2011
Here's the first Linux benchmarks of AMD's FX-Series Bulldozer desktop CPUs that launched on Tuesday. Specifically, it's Gentoo Linux performance results for an AMD FX-8150 Bulldozer.

The AMD FX-8150 Linux benchmark results can be found on OpenBenchmarking.org. It's an eight-core AMD FX-8150 on an ASUS Sabertooth 990FX motherboard with 4GB of RAM. Gentoo Linux was used with the Linux 3.0.6 kernel and GCC 4.5.3. Unfortunately, this system is not under my control and there's no direct comparisons available for this hardware system to any other AMD processors.

While there may not be any direct comparisons and these Bulldozer Linux benchmarks are coming in from an independent user running the Phoronix Test Suite and uploading the results to OpenBenchmarking.org, you can compare your system to this FX-8150 Gentoo desktop by running phoronix-test-suite benchmark 1110131-LI-BULLDOZER29 from the latest Phoronix Test Suite client.

Though thanks to the unique OpenBenchmarking.org feature-set, the OpenBenchmarking.org Performance Classifications (OPC) and OpenBenchmarking.org Performance Classification Index (PCI), you can see how this eight-core AMD Bulldozer compares to other Linux systems. Visit this link for the performance classification of this new octal-core processor.

With the OPC results, the "Processor Tests" are the important ones. The FX-8150 results overlayed on the OPC heat-maps indicate that the performance is high-end compared to all of the other systems on OpenBenchmarking.org that have run these tests in the past 120 days. The 7-Zip, NPB, OpenSSL, Tachyon, and Smallpt results highlight this processor the best while the performance in Crafty and EP.B NPB is not as desirable.