Tyche is a SiFive HiFive Unmatched computer with a 1.4GHz Freedom U740 RISC-V processor, 16GB RAM and a 1TB Samsung 970 Evo NVMe SSD.

The naming

When taking chances, the ancient Greeks sought the favor and protection of Tyche, their goddess of risk.


This is a quite overkill mITX build, but I decided to get components I can reuse for other builds as well at a later point.

ArticlePriceWhere from
HiFive Unmatched664.18€Mouser
Phanteks Enthoo Evolv (Micro Tower)61.00€Galaxus
be quiet! Pure Power 11 (300W)43.89€Galaxus
Samsung NVMe SSD 970 EVO98.45€MediaMarkt
Sapphire AMD Radeon R5 230 1GB DDR3 (used)16.00€eBay
Samsung EVO Select 128GB35.94€Amazon
Noctua NF-A4x10 FLX (40x10mm fan)14.89€Amazon
VARTA Lithium CR12201.84€Amazon


The case is very big, but it’s still lots of fidgeting to put all components inside. Note that the Unmatched board screws are not magnetic, which makes assembly more awkward than needed; replace them if you have magnetic ones.

The case does not have a reset button, even if the manual says so. But you can change the color of the LED!

Fan replacement

The stock fan is super loud which makes you not want to sit in the same room as the machine. I therefore replaced it with a 40mm Noctua fan. Together with the case fan this results in enough cooling.

To make the 40mm Noctua fan fit on the 20mm stock heatsink, I used a 3d printed adapter; be sure to use a heat-tolerant material such as PETG.


To be done, currently I’m running the stock freedom-sdk images.