SOC: Amlogic S905Y4
CPU: ARM Cortex-A35 (64 bit)
OS: AndroidTV 11 - 32bit build
Number of cores: 4
Max core speed: 2 Ghz (?)

RAM type: DDR (# ??)
RAM amount: 2GB

Storage Type: eMMC (solid-state)
Storage amount: 8 GB

Source: ADTH Quick Start Guide; first hand observation

SOC: Amlogic S905Y4-B
CPU: ARM Cortex-A35 (4-cores; 64-bit; max core speed 2 GHz (?))
GPU: Mali-G31 MP2
RAM: 2GB DDR3
Storage: 32GB EMMC
OS: Android 11 (32-bit)

Sources:

• GTMedia Store
• First-hand observation

SOC: Amlogic S905X4-B
CPU: ARM Cortex-A55 (64 bit)
OS: AndroidTV 11.0.2 (+?) - 32bit build
Number of cores: 4
Max core speed: 2 Ghz (?)

RAM type: DDR (2 or 3 ??)
RAM amount: 2GB

Storage Type: eMMC (solid-state)
Storage amount: 4 GB (?)

NOTE: This STB apparently has an HDMI 2.1 output port but may currently be limiting connections to HDMI 2.0.