sbc slot3. The Rock Pi 4 is an SBC based on the Rockchip RK3399 processor, featuring support for an M.2 M key slot that can be connected to a PCIe 2.1 x4 adapter board. 4.1.8 SBC with R1606G CT-NR101 Series. The CT-NR101 1.8 Embedded SBC is an extremely compact single board computer with an AMD Ryzen™ Embedded R1606G SoC processor