Cache is a way to enhance performance in a way that can come at a relatively modest cost in power if not in chip area. 8T SRAM cells don't use much power stati

Cache is a way to enhance performance in a way that can come at a relatively modest cost in power if not in chip area. 8T SRAM cells don't use much power statically, increasing size increases wire capacitance but you aren't switching any more transistors than with a 4mb cache save an extra level of muxing.