IBM Corp. unveiled two new PowerPC chips Thursday at an event in Tokyo, one month after its primary customer for those chips announced plans to switch to Intel Corp.’s processors. The new PowerPC 970MP is a dual-core version of the PowerPC 970FX, which users of Apple’s Power Mac and iMac computers know as the G5 processor. IBM also unveiled a low-power version of the 970FX chip with power consumption statistics that would make it suitable for a notebook. IBM had said little publicly about its PowerPC road map during the last several weeks of speculation, then confirmation, that Apple would...