Radxa CM3S Rockchip RK3566 SODIMM system-on-module supports up to 8GB RAM, 128GB flash, wireless module

Radxa CM3S (Compute Module 3 SODIMM), also called the ROCK3 Compute Module SODIMM, is a system-on-module with a 200-pin SO-DIMM edge connector powered by a Rockchip RK3566 processor with up to 8GB RAM, 128GB eMMC flash, and an optional wireless module with WiFi 4 and Bluetooth 4.2.

It follows the company’s CM3 module with Raspberry Pi CM4 form factor based on the same Rockchip RK3566 SoC, but in a more compact SO-DIMM form factor with a 200-pin edge connector that’s compatible with the Raspberry Pi Compute Module 3/3+, but not compatible with NVIDIA’s Jetson Nano, Xavier NX, and Orin NX 260-pin SO-DIMM modules, and you’d need to wait for the upcoming Radxa NX5 instead…

Radxa CM3S Compute Module 3 SODIMM

Radxa CM3S specifications can be found below along with the ones for the Radxa CM3 and Rockchip RK3568-based Radxa CM3I system-on-modules.

Radxa CM3
Radxa CM3S
Radxa CM3I
SoC
Rockchip RK3566 quad-core Cortex-A55 @ 1.8GHz
Rockchip RK3566 quad-core Cortex-A55 @ 1.6GHz
Rockchip RK3568(J) quad-core Cortex-A55 @ 2.0GHz
GPU
Arm Mali-G52 2EE GPU with OpenGL ES 3.2, OpenCL 2.0, Vulkan 1.1 support
VPU
4Kp60 H.265, H264, VP9 decode
1080p100 H.265/H.264 encode
NPU
0.8 TOPS
N/A
1 TOPS
Memory:
1GB, 2GB, 4GB or 8GB LPDDR4
Storage:
8GB, 16GB, 32GB, 64GB, 128GB eMMC flash
2x SATA ports, one shared with USB 3, one shared with PCIe
8GB, 16GB, 32GB, 64GB, 128GB eMMC flash
1x SATA port shared with PCIe
8GB, 16GB, 32GB, 64GB, 128GB eMMC flash
3x SATA ports, one shared with USB 3 host, one shared with PCIe, one shared with USB 3 OTG
Networking
Optional wireless LAN, 2.4GHz and 5.0GHz IEEE 802.11b/g/n/ac wireless, BT 5.0, BLE with external antenna
1x Onboard Gigabit Ethernet PHY
Optional wireless LAN, 2.4GHz IEEE 802.11b/g/n wireless, BT 5.0, BLE with external antenna
1x Gigabit Ethernet MAC (TBC)
Optional wireless LAN, 2.4GHz and 5.0GHz IEEE 802.11b/g/n/ac wireless, BT 5.0, BLE with external antenna
1x Onboard Gigabit Ethernet PHY + 1x Gigabit Ethernet MAC
USB
1x USB 2.0 Host port
1x USB 2.0 OTG port
1x USB 3.0 port (5Gbps)

1x USB 2.0 OTG port
2x USB 2.0 Host ports
1x USB 3.0 OTG port (5 Gbps)
1x USB 3.0 port (5Gbps)
PCIe
1x PCIe Gen 2 x1 (5Gbps)
1x PCIe Gen 2 x1 (5Gbps)
1x PCIe Gen 3 x2 (16Gbps)
I/Os
50x GPIOs with I2C, UART, SPI, PWM, ADC, etc.
60x GPIOs with I2C, UART, SPI, PWM, ADC, etc.
50x GPIOs with I2C, UART, SPI, PWM, ADC, etc.
Video Output
1x HDMI up to 4Kp60
1x 4-lane eDP 2.7Gps per lane
2x 4-lane MIPI DSI (1.6Gbps per lane)
1x LVDS (mux with MIPI DSI0)
1x HDMI up to 4Kp60
1x 4-lane MIPI DSI
1x 2-lane MIPI DSI
1x HDMI up to 4Kp60
1x 4-lane eDP 2.7Gps per lane
2x 4-lane MIPI DSI (1.6Gbps per lane)
1x LVDS (mux with MIPI DSI0)
Camera
2 x 2-lane or 1 x 4-lane MIPI CSI camera port
1x 4-lane MIPI CSI RX or 2x 2-lane MIPI CSI RX
1x 4-lane MIPI_D/C PHY RX
Audio
LINE Out, I2S, PDM (for mic array)
2x I2S, PDM (for mic array)
LINE Out, I2S, PDM (for mic array)
Host Connector
3x 100-pin 0.4mm pitch B2B connectors
200-pin SODIMM edge connector + unpopulated 100-pin 0.5mm pitch B2B connector
4x 100-pin 0.4mm pitch B2B connectors
Power Input
5V DC
Dimensions
55 mm × 40 mm
67.6 mm x 32 mm
70 mm x 40 mm

Note that some of the specifications differ depending on where you look on the Radxa website and I’ve done my best to try to be as accurate as possible, but there may be some small errors here and there. For example, the NPU is shown to be 0.8 TOPS, N/A, and 1 TOPS in the comparison table on the Wiki (filled with errors), but it’s all probably all 1 TOPS as rounded up from 0.8 TOPS…

The Radxa CM3 and CM3S will remain in production until at least September 2029 and the Radxa CM3I will be manufactured at least until September 2032.

Raspberry Pi CM3 Rockchip RK3566Radxa provides Debian 11 XFCE/Server and Ubuntu 22.04 Server images for the Radxa CM3S module and ROCK 3 Compute Module SODIMM IO Board, as well as PDF schematics, mechanical drawings, and a pinout diagram on their website. An Android 12 image should also be made available soon, and a wiki with detailed instructions is being worked on.

ROCK3 Compute SODIMM IO Board Radxa CM3S
ROCK3 Compute SODIMM IO Board with Radxa CM3S

The Radxa CM3S system-on-module is sold for $28 to $145 depending on wireless, RAM, and eMMC flash configuration, but note many variants are currently out of stock, while the IO board adds $25. Bundles can also be purchased on Aliexpress and Amazon. Further details may be found on the product page.

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2 Comments
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Tom Cubie
6 months ago

CM3S uses 1.6GHz RK3566 and it doesn’t support NPU, at least stated in the datasheet. So the Radxa Wiki is correct.

Khadas VIM4 SBC