> But vice versa, using the process and knowledge we gain from 5 nm chips might improve the lifetime of 7 nm chips by orders of magnitude Probably not. The pr

> But vice versa, using the process and knowledge we gain from 5 nm chips might improve the lifetime of 7 nm chips by orders of magnitude Probably not. The problems at each scale are very different and tend not to have much overlap. Process limitations also exist regardless- say you figure out that patterning transistors at 3 nm increases lifetime in a way that is applicable to 7 nm. 7 nm still can't take advantage of it as long as it requires 3 nm scale patterning, if there is even overlapping technology. Even if it requires adding a new step, say a wafer treatment that is necessary at 3 nm but optional at 7 nm, the economic benefit from increased lifespan is probably not worth retooling the old equipment.