"IBM and Georgia Tech have coaxed a chip to run at 500GHz, a record for a silicon-based device, by dropping the temperature to minus 451 degrees Fahrenheit. The experiment is part of a project to explore the ultimate speed limits of silicon-germanium (SiGe) chips. SiGe chips are similar to standard silicon chips, but they also contain germanium for better performance and lower power consumption."
"SiGe chips, the scientists theorized, could eventually hit 1 terahertz, or 1 trillion cycles a second."
From: News.com (Linked at previous site)
Two words.... Holy Crap.