The gallium arsenide chips were very expensive to make due to the frgility of the substrate(ie poor yields with high input costs), therefore they were only used for small io chips where you NEEDED that transistor speed, motorola has found a way to make a ga/a substrate ONTOP of a silicon substrate., which means the chip will be much more rugged, better yielding and maintain all of the speed advantages of the ga/a.
This is applicable to ANY semiconductor, the line lengths and timing would have to be changed, so a new design would be needed ofcourse, but this technology will give a HUGE benifit to future processors, and amd and intel would be stupid not to license it asap. Like soi, this technology would not require new tools(at least I dont think so, maybe some ga/a etch tools, but nothing super fancy! This devlopment is a good thing, a very good thing.
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