SiFive unveils P870 high-performance core, discusses future of RISC-V

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SiFive has just given a presentation at Hot Chips 2023 introducing the new high-performance P870 RISC-V core and its automotive equivalent the P870-A core, plus discussing RISC-V in general, its previous generation RISC-V cores, and what to expect going forward.

www.cnx-software.com/, Aug. 30, 2023 – 

SiFive has not officially announced the P870 and P870-A cores just yet, so most of the information we have from the English-speaking Internet is from ServeTheHome who managed to get some presentation slides, but this is also corroborated by various Chinese sources on Baidu and Guokr.

The P870 and P870-A RISC-V cores are new cores from the SiFive Performance family compatible with the RISC-V RVA23 profile and succeeding the SiFive P670 core. The SpecINT2k6 benchmark reports 17 points per GHz on the P870 compared to 13.2 points per GHz for the P670 (comparable to the Arm Cortex-A78) or about a 29% higher performance at the same frequency.

The SiFive P870 should be found in heterogonous SoCs with P670 and P470 cores, with each cluster using shared L2 cache, and potentially combined with multiple Intelligence X280 AI accelerators in data center chips.

The P870 microarchitecture diagram shows the out-of-order processor comes with 64KB I-cache, a 6-issue out-of-order pipeline, an FPU unit, vector extensions as well as L2 cache (shared per cluster) and shared L3 cache.

The diagram below shows what a 32-core P870 processor would look like and how the cache is distributed.

This is what a consumer RISC-V SoC based on the new core could look like with two P870 performance cores, four P470 efficiency cores, and an always-on E6 core, plus some other IP blocks such as WorldGuard security.

The P870-A is basically the same as the P870 plus functional safety (FuSa) features such as lockstep support, ECC cache, and an advanced RAS architecture. You'll find more slides about P870 and P870-A in the aforelinked article published on ServeTheHome website.

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