AMD Inc, the world's second largest chipmaker, announced updated plans for new computer server processors on Wednesday, including versions with six and twelve processing cores.

The Sunnyvale, California-based company is accelerating its pace to produce faster products in a shorter time as it battles rival Intel Corp in the business chip market.

AMD will introduce a new six-core Istanbul processor in the second half of 2009, followed by a twelve-core Mangy-Cours processor, the company said today. The firm expects the new chips to do more work per watt of power.

A new four core processor named Shanghai will be released in the second half of 2008, using the smaller, more advanced 45 nm manufacturing process.