The Power series was Power Computing’s first generation Mac compatible. As faster PowerPC 601 CPUs became available, Power bumped this model from 80 MHz to 100 MHz, and then to 120 MHz.
The LC 580 (a.k.a. Performa 580 and 588) is essentially an LC 575 with a new logic board that supports an IDE hard drive (instead of the more expensive SCSI hard drive used in earlier 500 series Macs) and uses a less expensive monitor.
The 75 MHz Performa 5200 was the first PowerPC Mac with an integrated monitor. Although the PPC 603 CPU was superior to the older 601, this computer’s architecture kept performance of the 5200 – and it’s monitor-less twin, the 6200 – comparable to a 66 MHz Power Mac 6100.