ROCK3 is available in two models, Model A and Model B. Model A has 2GB, 4GB and 8GB storage, Model B has 4GB and 8GB. The exact differences between Model A and Model B can be found in the specifications.ROCK 3B features a quad-core Cortex-A55 ARM processor, 32bit 3200Mb/s LPDDR4, up to 4K@60 HDMI, MIPI DSI, MIPI CSI, 3 .5mm jack with microphone, USB port, GbE LAN, PCIe 3.0, PCIe 2.0, 40-pin color expansion header, RTC. The ROCK3 also supports USB PD and QC powering.