At around 7nm, the current building blocks of sili

At around 7nm, the current building blocks of silicon transistors just won’t behave in the same way; when the gate is just a few atoms across, classical physics goes out the door and quantum physics (which behaves rather differently) takes over. While different transistor designs (such as 3D) allow us to take silicon a little further, the laws of physics will eventually catch up.
http://www.extremetech.com/extreme/186048-ibm...chnologies