SiFive is aiming to catch up to ARM by committing to deliver significant performance improvements in record time. The Performance P650 processors releasing next year will scale to 16 cores and deliver up to 81% performance increase per core compared to ARM's Cortex-A75.
https://www.notebookcheck.net/SiFive-announces-RISC-V-P650-16-core-processor-launching-in-mid-2022.582663.0.html