PCI Express (PCIe) has become the high-speed interconnect of choice in the server/storage, embedded, communications and consumer markets. As the data rate and bandwidth capabilities have scaled from Gen1 to Gen2 to Gen3, clock generator performance has become increasingly important. Jitter performance, power consumption, signal integrity, EMI, BOM cost and total PCB area are also critical factors that designers must take into consideration. This white paper discusses how to select the best clock device optimized for PCIe based on the evolution of the market and your unique requirements.