Hardware engineers, ASIC designers, software architects, and engineering managers have a new I/O architecture to consider when designing new platforms, components, and devices. Known as PCI Express (formerly 3GIO), the specification is expected to be provided by the PCI-SIG in July 2002. In this article, you will learn the fundamentals of the PCI Express specification and what makes it ideally suited for building innovative modular systems and devices that are smaller, faster, more efficient, and less costly.