The Power Mac G5 Dual and Power Mac G5 Quad introduce dual-core PowerPC processors, a modern PCI Express architecture, and wicked-fast workstation graphics. Apple on Wednesday introduced a new Power Mac G5 line featuring dual-core PowerPC CPUs and a PCI Express expansion architecture. The new 2.0 and 2.3 GHz systems are shipping now, and the new 2.5GHz “Quad” system will be available in early November. Prices range from US$1,999 to $3,299. The Power Mac G5 line now features four PCI Express expansion cards — PCI Express is a high-performance interface that has already seen great traction in the PC market for high-performance video and other applications, but this marks its debut on the Power Mac line. Last week, Apple introduced a refreshed iMac G5 system that also included PCI Express.