HiFive Unmatched

by SiFive

A high-performance RISC-V Linux development platform, in a desktop-ready Mini ITX mainboard

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HiFive Unmatched

HiFive Unmatched Mini-ITX Board, with onboard DDR4 RAM and SiFive Freedom U740 processor.


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The HiFive Unmatched from SiFive ushers in a new era of RISC-V Linux development platform in a PC form factor. Powered by the SiFive Freedom U740 RISC-V SoC and targeted for creating RISC-V applications, the platform features 16 GB of 64-bit DDR4 memory operating at 2400 MT/s, high-speed interconnects with PCIe Gen 3 x8 operating at 7.8 GB/s, Gigabit Ethernet, and USB 3.2 Gen 1. Software development is supported with Freedom U-SDK from SiFive, which provides a fast and convenient software environment to quickly build and modify a custom Linux distribution for this RISC-V PC.

The Freedom U740 SoC is the highest performance RISC-V processor available today, and the Unmatched board is ready to be your next desktop.

Click to enlarge


In February 2018, SiFive launched the HiFive Unleashed board, a demonstration and evaluation board for the highest-performance RISC-V processor available at the time, the Freedom U540. While it did not include common PC interfaces like PCIe or USB, it offered expansion opportunities via a ChipLink high-speed serial interface. A few months later, the Microsemi HiFive Unleashed Expansion Board launched to supplement the Unleashed with PCIe, USB, HDMI, and a host of additional peripherals for experimentation and development. This combination brought a usable desktop RISC-V PC to users for the first time.

The Unmatched board is a significant performance iteration and cost reduction from this combination, and SiFive is proud to be able to be able to bring an exceptional RISC-V platform to an even wider audience of users and developers.

Features & Specifications

  • SiFive Freedom U740 SoC (4 x U74 & 1 x S7 CPUs)
  • 16 GB (64-bit) DDR4 memory
  • 8-lane PCIe Gen 3 switch
  • PCIe x2 to USB 3.2 Gen 1 bridge
  • Four-port USB 3.2 Gen 1 hub
  • 32 MB Quad SPI boot flash
  • 256 KB EEPROM (for manufacturing data)
  • 10/100/1000 Ethernet
  • UART/JTAG support
  • Onboard temperature sensor
  • Onboard power management IC
  • MicroSD card socket
  • User I/O:
    • 4 x USB 3.2 Gen 1 Type A ports (1 charging port)
    • 1 x Micro USB UART/JTAG connector
  • Expansion:
    • x16 PCIe Gen 3 Expansion Slot (eight lanes usable)
    • M.2 Key M Slot (PCIe Gen 3 x4) for NVMe 2280 SSD
    • M.2 Key E Slot (PCIe Gen 3 x1) for Wi-Fi / Bluetooth
    • Header for FU740 I/O (I2C, SPI, QSPI, GPIO)
  • Mini-ITX form factor, 170 mm x 170 mm
  • 24-pin ATX power supply connector

Block Diagrams

Click to enlarge

Click to enlarge

1. DDR4 SDRAM9.Expansion header17. M.2 Key E connector
2. PMIC10. Current monitor18. M.2 Key M connector
3. QSPI flash11. JTAG header19. x16 PCIe connector
4. PCIe switch12. microSD card slot20. Front panel header
5. USB hub13. microUSB-UART console21. 24-pin ATX power connector
6. PCIe-USB bridge14. RJ45 connector22. FU740 reset
7. Ethernet PHY15. x2 USB connector23. Global reset
8. UART-USB controller16. x2 USB connector24. On/off switch

Support & Documentation

A full suite of documentation will be available on the SiFive website, including:

  • Getting started guide
  • Hardware reference manual
  • Design files, including the schematic, BOM, and PCB layout

Additionally, the board will ship with a microSD card preloaded with the SiFive Freedom U-SDK, including these components:

  • U-boot SPL (DRAM init)
  • OpenSBI
  • U-boot Proper
  • DT data
  • Linux Board Support Package (BSP) supporting:
    • PCIe switch
    • PCIe to USB bridge
    • USB hub
    • USB mouse/keyboard
    • Gigabit Ethernet
    • Thermal sensor
    • Power management IC (PMIC)
    • Third-party expansion cards currently being validated (not included):
      • M.2 Key E Wi-Fi / Bluetooth module
      • M.2 Key M NVMe SSD
      • PCIe GPU

What’s in the Box?

  • HiFive Unmatched Mini ITX board, with onboard CPU and RAM
  • 32 GB microSD card, preloaded with software
  • Rear panel I/O shield
  • M.2 screw package
  • Chassis mounting hardware
  • Cat-5 cable
  • Getting started guide

A typical desktop PC build will need to add:

  • Mini ITX-compatible case
  • ATX or SFX power supply
  • GPU
  • M.2 2280 NVMe SSD
  • Wi-Fi card

We are in the process of validating commodity SSD, GPU, and wireless card options. We will post fully validated recommendations in the coming weeks.

SiFive HiFive Unmatched



SiFive is the leading provider of processor cores, accelerators, and SoC IP to create domain-specific architecture based on the free and open RISC-V instruction set architecture. SiFive offers scalable, configurable processor cores pre-integrated with security, trace, and debug features for workload-specific accelerator designs. Founded by the inventors of RISC-V, SiFive has 15 design centers worldwide and backing from Sutter Hill Ventures, SK Hynix, Qualcomm Ventures, Western Digital, Intel Capital, Spark Capital, Osage University Partners, and Prosperity7 Ventures.

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