Yes ,we're looking at more and more quad core processors today. But how does current software really scale from single to dual and quad cores? In this case,there might not always be enough work to saturate four or more units.It can also be tricky to distribute the workloads to the workers,meaning that the physical interfaces - such as HyperTransport (AMD) orthe Front Side Bus (Intel) - might become a bottleneck in certainscenarios. As a third option, the mechanism that distributes theworkloads, which is the operating system's dispatcher, may also becomea bottleneck.