RISC-V Boom CPU
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I believe this particular chip is a research chip, and the first time that BOOM has been taped out in real silicon. Other RISC-V chips are based on the simpler, in-order Rocket design (eg. SiFive's HiFive Unleashed FU540); or are completely custom designs (eg. the Western Digital 32 bit chips that will soon be appearing in a hard drive near you).
Note that most Linux distros would not run on this chip out of the box, since the chip does not support the C-compressed extension. They would need to be recompiled. (Of course the chip being a research project and not generally available makes this rather theoretical)
Doing a run which would be vaguely profitable would require making millions of chips and cost millions of dollars up front, and very few projects could afford such a speculative investment.
SiFive did do a VC funded commercial run, but I bet they are not yet making a profit on their boards even though they cost $1,000 each.
https://en.wikipedia.org/wiki/Multi-project_wafer_service http://www.tsmc.com/english/dedicatedFoundry/services/cyberS...
It boots Linux, but at 6 mm^2, it's not really big enough to contain an on-chip memory controller, so going out to DRAM is through an FPGA controller and thus is painful.