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What is the big difference between ARM RISC chips and RISC-V?

RISC-V is an open ISA created by these guys: https://riscv.org/. ARM RISC chips are ARM IP and not open. There's a lot more to unpack there, but that's the gist of it.

Will we see general purpose risc v's? I mean, as a substitute for ARM for example

That's the idea yes

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