Interconnect structures having improved electromigration resistance are provided that include a metallic interfacial layer that is present at the bottom of a via opening. The control circuit is configured to update the first scoreboard to indicate that a write is pending for a first destination register of a first instruction in response to issuing the first instruction into a first pipeline. The actively dispersed material may be the same or different. The use of SAE in phosphor blends of lamps results in high CRI light sources with increased stability and acceptable lumen maintenance over, the course of the lamp life. The data structure can encapsulate the hardware specific characteristics of the various devices so that the application software written for the various devices can be written independent of the hardware-specific characteristics of the devices. There is monitoring of an amount of time that data controlled by each of the clusters is held in the cache memory of the cluster before being outpaged to the storage arrays.