For a 12x performance increase, the packaging alone would not be enough, the circuits on the chips themselves would also have to speed up. The Cray-2 appeared to be pushing the limits of the speed of silicon-based transistors at 4.1 ns (244 MHz), and it did not appear that anything more than another 2x would be possible. If the goal of 12x was to be met, more radical changes would be needed, and a "high tech" approach would have to be used.