Allwinner H6 CPU is widely used in preloaded boxes like Ubox UPro, UPro 2 and UPro S. EVpad 3rd gen EVpad 3S, 3, 3 Plus and 3Max are also using the box. Same for EVpad 5S and EVpad 5P. There are a few reports of them being a bit hot but mostly okay.
On the other hand, the CPU is hot and the vendor needs to be a bit careful in designing the box, sufficient heat sink needs to be used.
One of the popular yet hot generic box is Tanix TX6. It is hot because the heat sink is not adequate (even for the original version sold in Gearbest.
Tanix is now mostly selling lower end boxes in Gearbest as they no longer sell S905X2 based TX5 Max and S905X3 based TX3 in Gearbest.
Allwinner has come out with H616, the replacement for H6, to compete with S905X2 and S905X3.
https://www.cnx-software.com/2020/02...ts-android-10/
Ubox 8 (latest Ubox) now adopts H616 CPU. It has 4GB/64GB configuration, which is a step up from 7th generation UPro S (H6 CPU, 2GB/32GB) but in reality UPro S will be a better buy for Ubox.
Review of Tanix TX6S, a low end box with H616, 4GB/32GB or 4GB/64GB, 100Mbps Ethernet, USB 3.0+2*USB 2.0, 2.4GHz/5GHz wifi.
Unfortunately it is still hot based on the following review. So do not buy.