Inside Intel's Silverthorne ultramobile CPU
 

As we've seen in photos comparing Silverthorne to a penny, Intel's new chip is a tiny 25mm2. At only 47 million transistors (about 40 percent of that is a 512K, 8-way set associative L2 cache), it's also quite lean. By way of comparison, the 65nm Core 2 Duo (2MB cache) has around 290 million transistors. The Intel processor that comes closest to Silverthorne in transistor count is the Pentium 4, which had 42 million transistors in its 0.18 micron, 2001 launch incarnation.

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