The Pentium name will go into partial retirement in January, sources say. Intel will sell its upcoming Yonah processor for notebooks and thin desktops under two designations, according to sources: Duo and Solo. The Duo label will essentially mean that the chip inside has two cores; notebooks with a single-core Yonah will sport a Solo designation. As a result, the Pentium M designation for the company’s mobile chips vanishes, sources say, meaning the brand name that helped Intel establish its position in the market will fade out in a key product family. Server chips stopped carrying the Pentium name years ago, but the name is still used on current desktop and notebook chips.