An updated spec sheet reveals that the recently introduced Xeon E3-1290 runs at 3.6 GHz with four cores, but the chip's turbo boost will scale the clock speed to 4.0 GHz when running on only one core. What makes this processor particularly interesting is the fact that it is closely related to the i7-2000 Sandy Bridge series, which would indicate that Intel could be launching a 4 GHz desktop processor as well. Intel pulled a single core 4 GHz processor back in October 2004 due to the increasingly high power consumption and current leakage in its 90 nm Netburst architecture.
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