I haven't found any numbers for CPU speed, but the following story (which
requires a free registration) says that Motorola has come up with a way to
combine GaAs with silicon to produce significantly faster circuits. (It has
been said that Gallium Arsenide--GaAs--is the semiconductor material of the
future, and it always will be.)
http://www.nytimes.com/2001/09/04/business/04CHIP.html
Stan
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Photography by Stan McQueen: http://www.smcqueen.com