Advanced Micro Devices Inc. (AMD) said Phil Hester has resigned as senior vice president and chief technology officer effective Friday. As CTO Phil Hester was responsible for setting the architectural and product strategies and plans for AMD's microprocessor business. The official reason for his departure from AMD is that he's "looking to do new things." Phil Hester joined the chip maker in 2005. Before joining AMD, Hester was co-founder and chief executive officer at Newisys, a Sanmina-SCI company, and spent 23 years as IBM employee. AMD said Hester will not be replaced.