Advanced Micro held 21.5 percent, compared with 22.2 percent in the previous period and 17 percent a year earlier.
"Intel's getting pretty aggressive out there," said Mike Feibus, a Mercury analyst. "The pricing has been unbelievable, particularly for the older Pentium 4 stuff."
The company has chopped the cost of its Pentium 4 by as much as 84 percent since the chip's November debut, and analysts have predicted more cuts Oct. 28.
Intel started shipping more Pentium 4 chips than older Pentium IIIs two weeks ago, Executive Vice President Paul Otellini said. He'd previously predicted that change in product balance would come by year's end. Pentium 4 shipments quadrupled during the period from the June quarter, he said.
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