interface management techniques provide reduced power consumption along with reducing heat and emi generation in a computer system having multiple interconnected processing units . physical link layers of external interfaces that interconnect the processing units of have dynamically adjustable bandwidth and the bandwidths are dynamically adjusted by predicting interface bandwidth requirements . an interface controller detects events other than i / o requests that occur in a processing unit that are indicators of potential future transactions on one of the external interfaces connected to the processing unit . the interface controller predicts , from the detected events , that future transactions will likely occur on the interface , and in response , controls the dynamically adjustable bandwidth of physical link layer of the interface to accommodate the future transactions .