Isotropic Silicon?

jmichaelg asks: "The Register ran this story on isotropic silicon. Among the claims for isotropic silicon is that with a more homogenous lattice, heat is more evenly distributed. That means processors can reach higher speeds simply by being manufactured using isotropic silicon wafers. There's a sidebar at The Register about 1.7 Ghz Athlons manufactured with this stuff. According to the manufacturer's FAQ, isotropic silicon is produced chemically. Is this possible? I thought isotopes were chemically identical and differed only in the number of neutrons they have. Is this real or is it marketing froth?"