Core to core transactions and multithreaded applications will get the largest gain over C stepping, cores are equal clock for clock as C stepping.
These will show up as stepping 5.
D stepping runs at lower thermals, much lower from what I have seen.
920 is the first announced, not sure why but other models will also arrive as D stepping.
D stepping is capable of a much higher clock frequency, it will get easier to find a 5Ghz chip and we should see a lot more around 5.5Ghz on average.
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