I've been doing some tests with NanoPi M4 these days. While I'm not a professional board reviewer, here I can share some early performance numbers to you. Beware that none of these tests fit into real world use cases, they are just provided as-is. Besides, Armbian development on RK3399 boards are still at a very early stage, so any of these numbers may change in the future, due to software changes. Unless mentioned, all tests are done using Armbian nightly image, FriendlyARM 4.4 kernel, CPU