3D Carbon nanotube chips with processing and memory
interwoven in layers can achieve over 1000 times compute
speed and they have a demo chip:
"The 3D design enables scientists to interweave memory, which stores
data, and the number-crunching processors in the same tiny space, said
Max Shulaker, one of the designers of the chip, and a doctoral candidate
in electrical engineering at Stanford University in California."
See:
http://nextbigfuture.com/2015/09/3d-...hips-with.html