a tiled memory and a method of power management within the tiled memory provides efficient use of energy within a computer storage , which may be a spiral cache memory . the tiled memory is power - managed by placing tiles in a power - saving state , which may be a state in which storage circuits are powered - down and network circuits are powered - up , so that for serially - connected tiles , information can still be forwarded by a tile in the power - saving state . the tiles may be power managed under direction of a central controlled , which sends commands to the tiles to enter and leave the power - saving state , or the tiles may self - manage their power - saving state according to activity measured at the individual tiles . activity may be measured at the tiles of a spiral cache by comparing a hit rate and a push back rate to corresponding thresholds . the measurements may be used with either tile - managed or centrally - managed techniques .