SiFive
HiFive Unmatched Rev B
The HiFive Unmatched Rev B is a high-performance RISC-V Linux development platform housed in a compact Mini ITX form factor. It's powered by the SiFive Freedom U740 SoC, featuring multiple U74 and S7 cores, and comes equipped with 16 GB of DDR4 RAM. This board is designed for robust expansion, offering PCIe Gen 3 and M.2 slots, Gigabit Ethernet, and USB 3.2 ports. Enhanced for cluster environments with auto-start capabilities, it's an excellent choice for custom Linux development and advanced projects.
$740.00
Owner Satisfaction
4.1
/ 5
Category Rank
1397
/ 1560
#1397 in Development Boards
Price vs Category Average
+744%
Above average
Processor
74047417
/ SiFive Freedom U ( x U & x S CPUs)
Who it's for
- True RISC-V Development Platform
- Standard PC Form Factor
- High-Performance Multi-Core CPU
Who should skip it
- Immature Software Ecosystem
- High Cost and Limited Availability
- Power Efficiency and Heat Output
Key Specs
Processor
SiFive Freedom U740 (4 x U74 & 1 x S7 CPUs)
RAM
16 GB DDR4 (64-bit)
Form Factor
Mini-ITX (170 mm x 170 mm)
Storage
32 MB Quad SPI boot flash, 256 KB EEPROM
Connectivity
1x Gigabit Ethernet, 4x USB 3.2 Gen 1 Type A (1 charging)
Expansion
PCIe Gen 3 x16 slot, M.2 Key M (NVMe), M.2 Key E (Wi-Fi)
Power Input
24-pin ATX power supply connector
Debug Interface
Micro USB UART/JTAG connector
Features
- High-performance RISC-V Linux development
- Desktop-ready Mini ITX mainboard
- Supports custom Linux distribution building
- Cluster environment auto-restart support
- High-speed PCIe Gen 3 interconnects
- Includes preloaded SiFive Freedom U-SDK
- Robust expansion via M.2 and PCIe
- Powered by Freedom U740 RISC-V SoC
What customers say
Users highly regard the HiFive Unmatched Rev B as a monumental, high-performance platform essential for serious RISC-V development. Its professional grade hardware quality and Mini ITX design, supporting PCIe Gen 3 for advanced component integration, are key strengths. The core sentiment centers on its power for accelerating the architecture. However, this enthusiasm is balanced by the reality of working with a nascent ecosystem. Significant technical expertise is required due to challenges with software maturity, including bootloader and kernel configuration issues. This steep learning curve and high price position it as a necessary professional tool, valued for its capability despite the inherent user experience difficulties.
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