A big thanks Storx.

I started out with  DDR3L  1600/1333MHz 1.35 volt as that's what Onda states on its website:

http://www.onda.cn/MotherBoard_Specifications.aspx?id=373

I then went to DDR4 SO-DIMM DDR4 2133  1.2 volts. It's the same one vapourminer used - but only 4 GB instead of 8.

I can barely read the etching on the RAM slot but it looks like:
DDR4 ST12V       P (or D) R (or 4) 1710.



Cheers