U7 Series


The SiFIve U74-MC Standard Core is the world’s highest performance RISC-V application processor, capable of supporting full-featured operating systems such as Linux. The U74-MC has 4x 64-bit U74 cores and 1x 64-bit S7 core -- providing high performance with hard real-time determinism.

This U74-MC is ideal for applications requiring high-throughput performance with real-time guarantees (e.g., Enterprise Storage, Wireless/Wireline Networking, 5G Baseband Processors, SLAM Processors, Sensor Fusion, etc.)

U74-MC Key Features
  • Fully-compliant with the RISC-V ISA specification
  • 4x RV64GC U74 Application Cores
    • 32KB L1 I-cache with ECC
    • 32KB L1 D-cache with ECC
    • 8 Region Physical Memory Protection
    • Sv39 Virtual Memory support with 38 Physical Address bits
  • 1x RV64IMAC S7 Monitor Core
    • 16KB L1 I-Cache with ECC
    • 8KB DTIM with ECC
    • 8 Region Physical Memory Protection
  • U74 and S7 cores are fully-coherent
  • Integrated 2MB L2 Cache with ECC
  • Real-time Capabilities
    • The L1 Instruction Cache and the L2 Cache can be configured into high-speed deterministic SRAMs
  • Debug with instruction trace
  • Benchmark Scores
    • 2.5 DMIPS/MHz
    • 5.1 CoreMark/MHz

Compare to Cortex-A55 MP4

Cortex-A55 MP4
Instruction Set Architecture
4xRV64GC and 1xRV64IMAC
ARMv8.2, AArch32, AArch64
16-bit Instruction Support
Only in 32-bit AArch32 T32 mode
Physical Memory Protection
MMU only
Monitor Core
Interrupt Controller
Optional; pre-Integrated
Licensed Separately; requires separate integration

Series Overview

U7 Series

The U7 Series features SiFive’s highest-performance RISC-V Linux-capable application processor. The U7 core has a superscalar 8-stage pipeline with support for virtual memory, enabling the most demanding 64-bit RISC-V applications such as Edge Compute, Big-Data Analytics and 5G Base Stations.

U7 Series Highlights

Key Features

  • Up to 8 (+1) coherent high-performance RISC-V application processors
  • Supports an in-cluster coherent combination of application processors with real-time processors (U7 and S7)
  • Application processors with deterministic response
  • High-performance L1 memory microarchitecture
  • Physical Memory Protection
  • New microarchitecture features for enhanced security and real-time determinism


  • Enterprise Storage, Smart NICs
  • Edge Analytics, Big-Data Analytics
  • Autonomous Machines
  • Edge Compute and Switching/Routing
  • 5G Base Stations

All Standard Cores

Standard Cores
ARM Comparison
E2 Series
M0, M0+, M3, M4, M23, M33
E3 Series
R4, R5
E7 Series
M7, R7, R8
S2 Series
S5 Series
R4, R5
S7 Series
M7, R7, R8
U5 Series
A5, A7, A35, A53
U7 Series