1. An apparatus comprising: an input/output (I/O) device adapted to be coupled to an interconnect, the I/O device including: a first storage element adapted to hold a reference to a power-state associated with a performance metric and a power metric; and; a second storage element adapted to be updated by a power state write request received from the interconnect, the power state write request referencing the power state; and configuration logic adapted to configure the I/O device based on the performance metric and the power metric in response to the second storage element being updated by the power state write request.