Originally Posted by
chazus
Pretty much this, with anything similar (Like CPUs)
The smaller the process two things happen.
1) They become more expensive. Theoretically, smaller units = more units = money saving... But that's not true. The new tech costs more, and as they get smaller, they lead to...
2) They have lower yields. Again, theoretically, smaller units = more units... However the smaller they get, and more advanced they are, the higher failure rate.
Lets say you have 10,000 units on a wafer, and 40% fail. You then shrink them by 40% (As they did from Maxwell to Pascal). You now have 14,000 units, at a 60% failure rate. You're literally producing less sellable units, at a higher cost, which take longer to produce (2.5 months vs 3 months)
Not only that, but foundries are having problems with 16/14nm process in general.