The ToyBrick RK3399 Pro is a developer board that is powered by an RK399Pro SoC, which integrates an ARM Mali-T860MP4 GPU and an RK1808 NPU that can achieve up to 3.0 TOPS. The board can dual-boot Android and Linux out of the box and comes with up to 6 GB RAM and 32 GB of eMMC flash storage.
https://www.notebookcheck.net/The-ToyBrick-RK3399-Pro-a-Raspberry-Pi-sized-SBC-that-outperforms-the-NVIDIA-Jetson-Nano.420750.0.html