Even more is possible
Diamond processors in the future will be so powerful that silicon will melt.
Read this article that tells all about makers and manufacturing:
http://www.wired.com/wired/archive/11.09/diamond.html
Hmmm...6Ghz? Bah, more like 18 or 19 Ghz by the time we use real diamonds in the future. Hey, who said you couldn't have "bling-blingin' processors for CHEAP?

(Hey, why not dual cores too?) Hmm...
Quote: "No, they're real," I tell him. "But they were made by a machine in Florida for less than a hundred dollars."
picture: (A microwave plasma tool at the Naval Research Lab, used to create diamonds for high-temperature semiconductor experiments.)
Weingarten shifts uncomfortably in his chair and stares at the glittering gems on his dining room table. "Unless they can be detected," he says, "these stones will bankrupt the industry."
Put pure carbon under enough heat and pressure - say, 2,200 degrees Fahrenheit and 50,000 atmospheres - and it will crystallize into the hardest material known.