Arduino UNO Q 4GB (ABX00173) review

The UNO Q 4GB pairs a Qualcomm Dragonwing QRB2210 with a separate STM32U585 microcontroller. The Qualcomm chip has four Cortex-A53 cores at 2.0 GHz and an Adreno 702 GPU. The STM32 is a Cortex-M33 running at up to 160 MHz. The board runs full upstream Debian Linux alongside the real-time MCU, and Arduino App Lab is the main toolchain.

That split is the point of the board. Owners praise the hybrid design for running real-time Arduino code beside Linux. If your project needs both, one board covers it. If you only need a Linux computer, the specification offers less.

This version has 4GB of LPDDR4 and 32GB of eMMC. The 2GB model (ABX00162) has 2GB of RAM and 16GB of storage. Owner reports say 2GB is limiting, and the 4GB model was introduced for that reason. With 4GB, the board has more room for Linux services running next to your own code.

On raw speed, the picture is less flattering. One reviewer found it slower than a Raspberry Pi 5 at a similar price. Four Cortex-A53 cores at 2.0 GHz point to modest compute, so it suits light services and control tasks more than heavy workloads.

Storage is 32GB of onboard eMMC. The datasheet lists no SD card slot and no M.2 slot. What you buy is what you get, so choose the capacity tier with that in mind. You cannot swap the OS between cards, and there is no listed route to a larger drive.

Wireless is dual-band Wi-Fi 5 (802.11a/b/g/n/ac) and Bluetooth 5.1 on module WCBN3536A. The research lists no Ethernet port, and Gigabit or 2.5GbE speeds are not published. For a board you might leave running as a small server, that makes Wi-Fi the listed way to get on a network.

The board has a single USB-C port with USB 3.1 role switching. It also carries DisplayPort Alt-Mode through an ANX7625 bridge. Full HD (1920x1080) is supported, and 1280x720 is optimal in SBC mode. USB data speed is reduced when DisplayPort is active. If you want a monitor and fast USB devices at once, that shared port is a constraint.

The headers follow the Arduino UNO layout. JDIGITAL (18-pin) and JANALOG (14-pin) run at 3.3 V. JMISC (60-pin) is mixed 1.8 V and 3.3 V. JMEDIA (60-pin) and JCTL (10-pin) are 1.8 V. JSPI (6-pin) and a 4-pin Qwiic connector complete the set. Arduino doesn't publish a total GPIO count. The MPU GPIO runs at 1.8 V and the MCU pins at 3.3 V, so some carriers need level shifting. Check your shields and sensors against those voltages before you buy.

The board takes 5 V over USB-C at up to 3 A. It also accepts 7-24 V DC on VIN, or 5 V on the 5V_SYS pin. The recommended minimum is a 15 W PD supply. Owners report low consumption, around 0.5 W idle and 2-3 W at full power. That figure matters for battery or always-on projects.

One owner-reported quirk affects planning. The MCU cannot run without Linux, and the STM32 cannot be powered alone. If you were hoping to use it as a plain microcontroller board, expect the Linux side to be involved every time.

Upstream Debian is a clear plus for anyone who wants a familiar Linux environment. Arduino App Lab is the main toolchain for combining the two sides. The research gives no detail on community size or long-term kernel support, so check those before committing to a long project.

The UNO Q 4GB makes sense when the hybrid design is the reason you want it: Linux and real-time Arduino code on one UNO-format board, with low power draw. Owners describe 2GB of RAM as limiting, and this model carries 4GB. The trade-offs are no listed Ethernet, no storage expansion, a single shared USB-C port and CPU performance that one reviewer placed behind a Raspberry Pi 5. Buy it for the MCU and Linux pairing, not as a general-purpose mini computer.