After two weeks of testing a RIM4K unit (Amlogic S905X4, 4GB/64GB), the conclusion is clear:
The combination of Gigabit Ethernet, USB 3.0, and AV1 decoding means that even 90GB 'Blade Runner 2049' 4K remuxes loaded instantly. Scrubbing forward and backward was lag-free. The Wi-Fi antenna was strong enough to stream 4K from 50 feet away, though wired is always superior. rim4k.
While specifications vary by seller, a genuine "RIM4K class" device usually shares a common skeleton: After two weeks of testing a RIM4K unit