HiFive Unmatched
A high-performance RISC-V Linux development platform, in a desktop-ready Mini ITX mainboard
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.
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 Microchip (formerly 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. The HiFive Unmatched Rev B was introduced in 2023 in order to address supply chain availability issues and add better support for cluster environments - in all other ways it is functionally the same as the original.
| 1. DDR4 SDRAM | 9.Expansion header | 17. M.2 Key E connector |
| 2. PMIC | 10. Current monitor | 18. M.2 Key M connector |
| 3. QSPI flash | 11. JTAG header | 19. x16 PCIe connector |
| 4. PCIe switch | 12. microSD card slot | 20. Front panel header |
| 5. USB hub | 13. microUSB-UART console | 21. 24-pin ATX power connector |
| 6. PCIe-USB bridge | 14. RJ45 connector | 22. FU740 reset |
| 7. Ethernet PHY | 15. x2 USB connector | 23. Global reset |
| 8. UART-USB controller | 16. x2 USB connector | 24. On/off switch |
A full suite of documentation will be available on the SiFive website, including:
Additionally, the board will ship with a microSD card preloaded with the SiFive Freedom U-SDK, including these components:
A typical desktop PC build will need to add:
We are in the process of validating commodity SSD, GPU, and wireless card options. We will post fully validated recommendations in the coming weeks.
Produced by SiFive in San Mateo, CA.
Sold and shipped by Crowd Supply.
The latest revision of the SiFive's Mini-ITX board with 16 GB of onboard DDR4 RAM and SiFive Freedom U740 SoC. This version runs exactly the same firmware and software as the original, and has additional features to accommodate operation in cluster environments (automatic start on power and restart if shutdown).
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.
