PCPER.com: 5 GHZ+ Phenom II Overclock on Dry Ice, 6Ghz on LN2

[Calmatory]

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"One of the first enhancements, and perhaps the biggest change, is the increase of the L3 cache from 2MB to 6MB. On average, it's expected that this will increase performance by anywhere from 5-10%." + the claimed branch predictor, TLB and prefetcher improvements. Besides, as I said, it is hugely dependent on the programs used, there is no way of saying "average" really. For some people the average improvement might be 4-7, and for another 10-13% due to very different kinds of programs used. And after I think about it more troughly, I agree, it is a bit optimistic, yet possible.

This might be fake though, but it is all I found. As it suggests, the IPC improvement varies a lot between apps.