SAN JOSE, Calif. (AP) - Delivering on its promise of a superfast server chip, IBM Corp. said Monday that its new Power6 microprocessor will go on sale next month, boasting twice the clock speed of the previous generation while consuming roughly the same amount of power. The dramatic performance boost comes as the semiconductor industry has largely shifted its focus away from pure performance measurements—overheating becomes a major problem as transistors shrink and operate at breakneck speeds—and instead has become more concerned with a balance of performance and power consumption. While other chipmakers are dialing down clock speeds and adding...