A 3D cube of chips, using bare chips mounted one over the other with spacers in between. As this technology matures, it is expected that up to 100 chips can be used in one cube.
"chip on chip." YourDictionary, n.d. Web. 16 May 2018. <http://www.yourdictionary.com/chip-on-chip>.
chip on chip. (n.d.). Retrieved May 16th, 2018, from http://www.yourdictionary.com/chip-on-chip