Now that Perkam mentioned the slide wombat posted,I don't share the enthusiasm of some posters about 3.6-3.8Ghz clock speeds for 8C. It would be great,but let's be a bit more realistic ,shall we?
As for QC Zambezi,maybe a speed in line with current X4s,around 3.4Ghz + turbo .At least that is what I expect.