writes: "AnandTech has posted a story about AMD's new Athlon 4 processor and also included some information about Silicon on Insulator transistors in their article. SOI technology has been used by IBM in recent history and AMD will begin using it in 2002."
This is the chip which has been known for a while as Palomino. Reader Diabolus points to the same article, saying "the big news is a 20% reduction in power consumption, and that they'll be using the exact same chip for servers, workstations, desktops and even notebooks. The article details exactly what is new compared with the Tbird."