I hope you don’t want to sell this? Heat dissipation is nothing that has been thought of, right?
@Tigger: you know how much heat fast NVMe SSDs generate so heat dissipation is not only a challenge with powerful SoCs like RK3399 but also with those SSDs? Not only SoCs will throttle down when overheating but those SSDs too (all the better flash memory products in general). Last year I tried to fit a tiny M.2 SATA SSD into a an also tiny USB3 enclosure just to realize that this simply can’t work. From 500 MB/s down to 30 MB/s while running some boring drive benchmarks within minutes and SMART reported drive temperatures well above 85°C.