Overclockers Australia has managed to get their hands on some, ironically, underclocked developper Athlon processors based on the upcomming Thoroughbred core.
The new core features a die size shrink and many other improvements, the most noticible is the fact that it runs at a mere 1.6v, and thus allowing much less heat to dissipate. The guys over at OCAU manage to overclock the 1900+ that they received to an amazing 2.1ghz.
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As you can see the Tbred die is smaller and looks much like the new Durons. As mentioned earlier there is no change in core height that I can detect. Two other noticeable things are: resistors previously found on bottom of packaging have been moved to the top; and the core no longer has the batch/stepping information written on it. Otherwise the CPUs are identical to my eye.
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Definetly worth a read. Check out the full article
here.