What is 3D exactly?
Intel calls it generically 3D but technically it's a Tri-Gate transistor. The traditional flat two-dimensional "planar" gate is replaced with a thin three-dimensional silicon fin that rises up vertically from the silicon substrate.
The gate wraps around the fin. The current is controlled by using a gate on each of the three sides of the fin--two on each side and one across the top--rather than just one on top, as is the case with the 2D planar transistor.
So, 3D or vertical transistors become necessary. And Intel isn't just talking about this theoretically, it's going to manufacture chips based on these transistors
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