SK Hynix H5TQ4G83AFR = 512M x 8 27 RMB that means EIGHTEEN dollars just in RAM ICs. that's if you can get hold of them.
RAM continues to be a problem to source.
KiCAD version of R40 server board on a go slow pace at the moment - https://hellosemi.com/hypercube/pmwiki.php?n=Main.KiCADServerBoard%0F (Some errors have left the power lines crossed in multiple places.) Also can't seem to raise Allwinner (no replies). Probably manage without tech support for now.
In the mean time, been doing other KiCAD boards. A blue pill (ST clone of Atmega Arduino) - https://hellosemi.com/hypercube/pmwiki.php?n=Main.HypercubeBluePillSTDuinoBo...
There is some infographic here about how to make intelligent Lithium battery packs for autonomous systems - https://hellosemi.com/hypercube/pmwiki.php?n=Main.HypercubeLithiumPrototypin...
And some info here about R40 boards for modularized AI + vision recognition and getting it to do some work with Arduino to do basic IoT work with it - https://hellosemi.com/hypercube/pmwiki.php?n=Main.AIBoards%0F
All the other open source boards (or soon to be) https://hellosemi.com/hypercube/pmwiki.php?n=Main.OpenSourceBoards%0F