That's true but you can get creative in a case where you don't need to page things back in from the disk. You could do something like powering off the entire s

That's true but you can get creative in a case where you don't need to page things back in from the disk. You could do something like powering off the entire system (assuming you have this kind of memory in the CPU too) while you're waiting for a disk read, if there's nothing else to do. So I could see big potential for power savings in things like phones and other battery powered devices.