Rev B

Freedom Unmatched

Based on the success of the HiFive Unleashed and Linux software ecosystem enablement, HiFive Unmatched ushers in a new era of RISC-V Linux development with a high performance development platform in a standard PC form factor.

HiFive Unmatched Rev B
Features & Specifications

The development board is powered by the SiFive Freedom U740 (FU740), an SoC that includes a high-performance multi-core, 64-bit dual-issue, superscalar RISC-V processor (SiFive Essential™ U74-MC) with 16GB of DDR4, Gigabit Ethernet, PCIe expansion, USB 3, and M.2 sockets for Wi-Fi, Bluetooth and NVMe storage. A 5th core (a SiFive Essential S71 monitor core) is available for real time applications. SiFive Mix+Match technology offers a potent combination of application and real-time processing. The S71 (RV64IMAC) can service auxiliary functions and cooperate with the U74-MC cluster, making this an ideal heterogeneous software development platform where Linux and a RTOS can co-exist.

The updated HiFive Unmatched Rev. B boards are available under Mouser part #115-HF105-001 and are ready for fulfillment from the warehouse in a couple of weeks from the time an order is placed.


SiFive Freedom U740 SoC



Flash Memory

32MB Quad SPI Flash

Removable Storage

MicroSD Card


Gigabit Ethernet Port

User I/O

4x USB 3.2 Gen 1 Type A Ports (1 Charging Port)

1x MicroUSB Console Port

Expansion Capabilities

x16 PCIe® Gen 3 Expansion Slot (8-lanes Useable)

M.2 M-Key Slot (PCIe Gen 3 x4) for NVME 2280 SSD Module

M.2 E-Key Slot (PCIe Gen 3 x1) for Wi-Fi / Bluetooth Module

Board Form Factor

Industry Standard Mini-ITX


170 mm


170 mm


Advantages of HiFive
Unmatched Rev B

If you’re a serious software developer, kernel developer, or Linux hacker, we can think of a few reasons to use this board:

  • Port software to the RISC‑V platform
  • Evaluate the SiFive U74‑MC SoC
  • Want multi-core, Linux-capable RISC‑V hardware
  • Want to support open source hardware
  • Need to create the next great thing!