Re: Explanation
Sizing was covered a few weeks ago in another chip story. It seems that for the last couple of years the sizes have only been notional. Eg. 14 nm could be the equivalent of 2 layers of transistors fabbed at 30nm but has the number of transistors it would have if they had squeezed them down. 7nm might be 4 layers of 30nm fab or 2 layers of 16nm. Note these are all layers of transistors, not doping layers which may be 5 or more per transistor layer. I cant remember how many transistors they had per mm2 but the point was they had achieved 15 times more than a legacy 30nm chip so they called it 2nm even though it was still using 12nm lithography which i think is about the limit even for hard UV