1. A method comprising: storing one or more memory requests in a request buffer, each memory request targeting a memory device in a memory system having one or more memory devices, each memory device having a first power state and a second power state; issuing each memory request in an order from the request buffer to the memory system; identifying the memory device targeted by one memory request from the request buffer prior to or while another memory request ahead of the one memory request is issued to the memory system and performed by the memory system; and placing or maintaining the identified memory device in the second power state prior to issuing the one memory request to the memory system.