Advanced Micro Devices plans to announce Tuesday that it will split into two companies - one focused on designing microprocessors and the other on the costly business of manufacturing them - in a drastic effort to maintain its position as the only real rival to Intel.

In addition, the company said two Abu Dhabi investment firms would inject at least $6 billion into the two firms, mostly to finance a new chip factory that A.M.D. planned to build near Albany, N.Y., and to upgrade one of the co...

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