The Extreme Edition chip will support dual cores, each with Hyperthreading -- it will look like a 4-way to the operating system. Will come with the 955 Genwood chipset.
The "regular" P4 variation on Prescott will not be HT. Comes with the 945 Smithfield.
My guess is throughput on the EE chip at 3.8 GHz will be ~40-50% better than today's uniprocessor EE @ 3.8 GHz on some multiprocessing applications...but your milage will vary.
Expect mass-market consumer machines based on this new technology on a limited basis in June, and in volume for the back-to-school season starting in July.
Peter S. Kastner
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