AMD's account was previously split between McCann's fellow Interpublic agency, Hill Holliday Connors Cosmopulos Boston in the US, and Publicis in Europe.
The consolidated task will include corporate brand and product advertising for AMD, which is currently the world's second-largest microprocessor manufacturer after the market leader, Intel.
McCann will be tasked with improving AMD's brand profile in competition with Intel. Its rival has achieved high global recognition through Euro RSCG's ads featuring funky figures working inside computer chips. The most recent spot showed a band of space aliens travelling to earth in search of advanced computer technology.
Hill Holliday's stateside work for AMD included the special effects epic "flat world
about a three-dimensional girl trapped in two-dimensional surroundings.
AMD recently signalled a shift in marketing strategy for microprocessors by giving its latest product a name, Athlon, rather than a number, and argued that speed was not the only criterion for judging chips' performance.
"We saw a lot of great work and incredible strategic thinking throughout the review process,
Bob Kennedy, AMD's director, corporate branding, said. "McCann-Erickson demonstrated a comprehensive understanding of AMD's technology strengths and it has the global network to communicate the strengths around the world."
McCann already handles the international Microsoft account, which is also run from the network's San Francisco agency.