Originally posted by: otispunkmeyer
barebones generally are smaller, and therefore most require custom mother boards, which are usually desgined by the people who make the kit. so in a bare bones you get a case, and if its not mATX you'll get a custom motherboard preinstalled and a custom PSU pre installed
you need to add, ram, cpu, video, cd/dvd and hdd your self, but there is no need to buy a mobo or psu