IBM claims that it has weathered the transition from 130-nm to 90-nm microprocessor chips as well as its competitors, reports eWeek in a story noted at MacSurfer. So where are the 3GHz Power Macs Apple CEO Steve Jobs promised a year ago? So far, most of the discussions with IBM’s fab have dealt with the “defect density,” the number of devices on the wafer that actually work; however, as Apple’s case points out, the issue may also be with IBM’s ability to “speed-bin” chips to meet its customers’ demands. Naturally, IBM’s yields are a secret, and IBM executives wouldn’t talk specifics.