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Here, see slides 24, 43, 44 in particular. RISC-V cores run about half the area and power of the competition.

https://riscv.org/wp-content/uploads/2016/01/Wed1345-RISCV-W...

The SiFive chip is >300MHz on a 180nm process, but the higher end rise-v chips while having competitive perf/clock still have lower clock speeds than the big guys. That is probably just a matter of time though.




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