The cream of the crop is the Xeon X5680, a 3.33GHz processor with exactly the same specs as the Core i7 980X, plus of course the second QPI link and dual processor support. It shares the coveted title of definitely the fastest x86 general purpose processor as of today, a position that even AMD's dual-die Magny-Cours monster is unlikely to challenge. I guess the only challenger could be an even faster X5690 stepping up, until Intel's next generation 'Sandy Bridge' high end chippery arrives a year from now.
By the way, this processor chip doesn't support unlocked multipliers in its current stepping, however that could change soon.
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