At one time, Intel, TSMC and Samsung were aggressively beating the 450mm drum. Chipmakers wanted, if not demanded, 450mm pilot line fabs by 2016, with high-volume manufacturing 450mm plants slated by 2018.
At least for those companies, 450mm made some sense. Moving to 450mm wafers would supposedly give chipmakers a 2.25x boost in wafer area and a 30% cost reduction over 300mm substrates. But...
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