Abstract: Apparatus comprising a memory having a plurality of memory locations to store data; a switch coupled to said memory to provide power to each memory location of said plurality of memory locations; and a controller coupled to said memory to monitor use of said plurality of memory locations, and coupled to said switch to switch it from a disabled state to an enabled state to provide power to those memory locations of said plurality of memory locations in use; and method comprising monitoring use of a plurality of memory locations in a memory to determine which memory locations are in use; and controlling a switch to turn on power to those memory locations of said plurality of memory locations in use.