0kirdaihtBest Answer 11 years ago even if it was possible to use a part of the harddisk for ram, you would not even want to do this. ram is a few dozen times faster then a harddrive. using the harddrive for ram ( which MIGHT be possible, if you could somehow trick your computer into thinking that part is ram memory, aka swap file. This would probably require you to build your own bios/operatingsystem/both), would make your computer way to slow to do anything. RAM memory also is one of the least of your conserns if you want to save power. you should start looking at the efficiency of your PSU, If you have a cheap one with < 80% efficiency you might want to replace it with a more expensive high efficiency one ( > 90 %) . You could also look for some programs which automaticly underclock the processor or disable cores when it isn't fully used, remove your graphics and sound cards ( if you have a graphics/soundcard on your motherboard).