The Vamrs “RK3399 Sapphire” SBC is on sale for $75, or $349 for a full kit. Vamrs is also prepping an RK3399-based “Rock960” 96Boards SBC. Rockchip’s RK3399 is one of the most powerful ARM-based system-on-chips available on hacker boards, featuring two server-class Cortex-A72 cores clocked at up to 2.0GHz, as...