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SiFive Reveals New RISC-V Chips, the P670 and P470

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SiFive introduced a pair (opens in new tab) of latest high-performance RISC-V (opens in new tab) processors geared toward what it calls “next-generation wearables and sensible shopper units.” Often called the P670 and P470, the processors provide new options and improved efficiency in comparison with earlier CPUs primarily based on the favored open-source structure.

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There’s assist for virtualization, together with a separate IOMMU for accelerating virtualized machine I/O, and a full out-of-order vector implementation primarily based on the RISC-V Vector v1.0 spec that was ratified final 12 months. The chips declare to be the primary available on the market to assist the brand new RISC-V vector cryptography extensions. In addition they exhibit enhanced scalability, with clusters of as much as 16 cores in a position to work collectively, although the corporate has talked up 128 cores previously.

SiFive’s 600-series is performance-focused — the P670’s predecessor the P650 (opens in new tab) was anticipated to match the Arm Cortex A-77 for efficiency — whereas the 400-series is extra of an effectivity chip. The P550 was the chip of selection for Intel’s Horse Creek improvement board, which paired RISC-V with DDR5 RAM and PCIe 5.0. Intel tried to purchase SiFive for $2 billion this time final 12 months, however the deal fell aside (opens in new tab) after the businesses didn’t agree phrases.

The P670 is constructed on a 5nm course of and may obtain a most clockspeed of greater than 3.4GHz. SiFive’s description makes it sound like a P650 with two added vector items, and the brand new chip goals to beat Arm designs within the performance-per-mm metric that measures the house a chip takes up towards its processing functionality.

The P470 is designed as a companion chip for the P670, and we anticipate it to look in massive.LITTLE configurations in precisely the identical means Arm chips do in smartphones and tablets. It’s additionally designed on a 5nm node and hits the identical clockspeed as its larger brother. A P450 additionally exists, which is a P470 with out its single vector unit, and it has been area-optimized to slot in notably small locations.

“The P670 and P470 are particularly designed for and able to dealing with probably the most demanding workloads for wearables and different superior shopper purposes. These new merchandise provide highly effective efficiency and compute density for firms trying to improve from legacy ISAs,” mentioned Chris Jones, SiFive VP of product. “We’ve got optimized these new RISC-V Vector enabled merchandise to ship the efficiency and effectivity enhancements the trade has lengthy been asking for.”

There isn’t any information of when the P670 and P470 shall be accessible, nor which firms shall be utilizing them.

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