3 ms·
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.
by drmpeg 6y ago
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.
- kinghajj 6y agoSonicBOOM, 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.pdf https://carrv.github.io/2020/papers/CARRV2020_paper_15_Zhao....
- opencl 6y agoThe 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.
- brucehoult 6y agoThe 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...