Re:PicoRio Linux RISC-V SBC is an open-source alternative to...
by drmpeg on Friday September 04, 2020 @08:49PM
(#24380476)
I'm a little concerned that these RV64GC implementations all end up at about 500-600 MHz. There's plenty of 1.5 GHz ARM processors at 28 nm.
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Re:PicoRio Linux RISC-V SBC is an open-source alternative to...
by kinghajj on Friday September 04, 2020 @10:15PM
(#24380877)
SonicBOOM, the latest of the Berkley Out-of-Order Machine from UC Berkley, was fabbed for running at 1 GHz.[0]
[0]: https://carrv.github.io/2020/papers/CARRV2020_paper_15_Zhao....
Re:PicoRio Linux RISC-V SBC is an open-source alternative to...
by opencl on Saturday September 05, 2020 @11:13AM
(#24384122)
The achievable clock speed is mostly a function of the pipeline depth and how well the design is optimized, the ISA should have very little impact on it. There are a bunch of high-clocked high-performance ARM chips available because several huge companies have already made large R&D investments into developing them.
Re:PicoRio Linux RISC-V SBC is an open-source alternative to...
by brucehoult on Saturday September 05, 2020 @09:05PM
(#24388133)
The SiFive HiFive Unleashed has quad RV64GC plus one RV64IMAC and runs at around 1.5 GHz in TSMC 28nm -- mine's a little unstable at 1.5 after three or four hours at full load, but it's perfect at 1.4.
It was pricey at $999 because the chips are from low volume "shuttle run" aka MPW production (probably $300 or $400 each -- would be maybe $10 in volume production) and the board has 8 GB DDR4 2400 and other expensive things such as FMC connector.
But it's well faster than a Pi 3 and I've had 2.5 years of use out of it already...