ROCK PI 4 Model C+ SBC features Rockchip RK3399-T 1.5 GHz processor, dual HDMI output

ROCK PI 4 Model C+ is a single board computer (SBC) powered by a 1.5 GHz Rockchip RK3399-T hexa-core processor, equipped with 4 GB of RAM and two micro HDMI ports to drive up to a 4K display and a 2K screen.

This is yet another ROCK PI 4 SBC from Radxa, and the first to use the downclocked RK3399-T processor with other models based on the 2.0 GHz Rockchip OP1 processor (overclockable to 2.2/2, 4 GHz) or the traditional Rockchip RK3399 @ 1.8 GHz (overclockable to 2.0 GHz), and also the first in the family to offer dual HDMI output.

Specifications of the ROCK PI 4 Model C+:

  • SoC – Rockchip RK3399-T big.LITTLE hexa-core processor with
    • 2x Arm Cortex-A72 @ up to 1.5 GHz (overclock up to 2.0 GHz)
    • 4x Cortex-A53 @ up to 1.4 GHz (overclock up to 1.6 GHz). Note the processor datasheet says Cortex-A53 cores are limited to 1.0 GHz, but Radxa has confirmed the 1.4/1.6 GHz figures.
    • Mali-T864 GPU with OpenGL ES1.1/2.0/3.0/3.1, OpenVG1.1, OpenCL, DX11 and AFBC support
    • VPU with 4K VP9 and 4K 10-bit H265/H264 decoding, 1080p60 H.264 hardware encoding
  • System Memory – 4GB LPDDR4
  • Storage
    • microSD card slot
    • eMMC socket up to 128 GB
    • Support M.2 Key B 2230 NVMe SSD up to 2TB (PCIe 2.0 x4)
    • Optional 4MB SPI flash with support for NVMe or network boot (Note: this will reduce available DSI lanes by 2)
  • Video output/display interface
    • Micro HDMI 2.0 port up to 4K@60Hz
    • Micro HDMI 2.0 port up to 2K@60Hz
    • 4 lane MIPI DSI via FPC connector (only 2 lanes if SPI flash is soldered to the board)
    • Support for two independent displays (not three before 2K HDMI and MIPI DSI interfaces were multiplexed)
  • Audio – 3.5mm stereo audio jack + mic, digital audio via HDMI; RK817 HD codec supporting audio up to 24-bit/96kHz
  • Camera – 2-way MIPI-CSI2 connector for cameras up to 8MP
  • Connectivity
    • Gigabit Ethernet RJ45 port with PoE via additional HAT
    • Dual-band 802.11ac WiFi 5, Bluetooth 5.0 (AzureWave AW-CM256 module) with u.FL antenna connector
  • USB – 2 USB 3.0 host ports including OTG (top), 2 USB 2.0 host ports
  • Expansion – 40-pin expansion connector with 1x UART, 2x SPI bus, 2x I2C bus, 1x PCM/I2S, 1x SPDIF, 1x PWM, 1x ADC, 6x GPIO and power signals (5V, 3.3V and GND )
  • Miscellaneous – Power Button, PWM Fan Header
  • Power – 5V/3A via USB-C port (5V/5A recommended if SSD is connected)
  • Dimensions – 85 x 54mm

Rock Pi 4 Model C+Radxa provides support for Debian/Ubuntu Linux, Android 7.1/9.0/11 for the card, with open-source GPU drivers (should be Panfrost), as well as hardware access/control library for Linux/Android. All RK3399/OP1 processors are software compatible, so you will be able to follow the same wiki as for other ROCK PI 4 boards.

The Rockchip RK3399-T simply lowers the BoM cost with a few other optimizations.

ROCK Pi 4 comparison

Besides the Rockchip RK3399-T processor, another major difference is that the new ROCK Pi 4 Model C+ SBC no longer supports USB PD, and you need to power it with a 5V USB-C power adapter. Radxa managed to free up 2 lanes for MIPI DSI, which should also enable the extra 2K micro HDMI port, unless you’re also soldering on an SPI flash. The audio codec and wireless modules have also been changed with the ESS ES8316 chip and AP6256 modules making way for the Rockchip RK817 audio codec and AzureWave AW-CM256 module without changing key specs.

ROCK PI 4 Model C+ is currently sold on Allnetchina for $59.99 plus shippingas well as on top Ameridroid for $64.95 (Note that the photos are correct, but the specs on Ameridroid are wrong at the time of writing).

Thanks to j_c for the tip.

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Steven L. Nielsen