why could intel not just go with 12nm
Ultimately , 12 nm is just a label at this point .
Globalfoundries' 12nm tech was not much more than an optimized variant of their 14nm tech.
If you're suggesting intel go with GF 12nm , then you should know that intel's 14nm is ultimately superior to 12nm GF . It's faster and denser ( or at least just as much), not to mention a shift to that tech would require porting all their designs to work with GF's process.
But i don't think that's what you mean .
Do you mean " Why doesn't intel introduce a stopgap process until 10nm , with a less aggressive shrink ".
The answer :
-Making a dedicated process from scratch requires a lot of money , which would be foolish for something which is essentially a short lived stopgap
-They already are... sort of :
Intel's improved 14nm processes (14nm+ and ++) fit this description in a way . What they did was take the existing 14nm process and add many of the features they were planning to introduce in 10nm. Single dummy gates and COAG were originally planned to debut in 10nm , but were introduced in these 14nm processes , which reduced size and increase performance . They didn't do much for power by themselves , but that was mostly dealt with by standard node improvements as expected of a mature process.
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