Intel Corp. plans to begin shipping microprocessors that have four computing engines on a single chip — products that analysts say will help it win back market share from rival Advanced Micro Devices Inc.

The first chip, the Intel Core 2 Extreme quad-core processor, will be available in November. Intel says it will deliver a 70 percent performance improvement over Intel’s current chips, which have one or two computing cores. The new chip is aimed at gamers, programmers and other people with heavy-duty computing needs.