a system and method for reducing bottlenecks on a computer bus , by offloading specific types of high - bandwidth data from the system bus and passing that data directly to specialized target busses . in the computer system , the system bus , typically a pci bus , is monitored for addresses corresponding to specific target devices . when these addresses are detected , the corresponding data is diverted from the system bus to the appropriate specialized bus . by doing so , bandwidth across the system bus is reduced , and the specialized data , which may be time - sensitive or real - time audio or video , is passes rapidly to the appropriate processor .