Upgrading soldered RAM (disqussion, board design, parts)

[diix]

Hi. This video (Raspberry Pi 4 RAM Upgrade - Tutorial) is about upgrading Pi RAM from 1GB to 8GB, and it is inspired me to investigate possibility to do this for other boards.

If anyone has any ideas and knowledge, please share it with us.

I personally interested in NanoPi NEO4 with RK3399 CPU and with 1GB RAM
Schematic for looking at RAM and board wiring.
RAM consist of 2 512Mb chips on one channel  (second channel on this board is not used)

RAM Chips: K4B4G1646E-BCMA 4Gbit(4096bit/8=512Mb) DDR3-1866 96Ball FBGA.
CPU supports DDR3, DDR3L, LPDDR3, LPDDR4.

There are at least 1GB DDR3 chips out there. (not sure about 2GB, and probably no 4GB)
There is no question that larger DDR3 with same specs should just work (DDR3-1866 96Ball FBGA.), unless somehow not compatible with wiring or datasheet specs.
What about other types, DDR3L, LPDDR3, LPDDR, are they different pinout layout or board design might be incompatible?
Any chip recommendations ?

I probably could answer all these questions with more time spend researching, maybe someone could tell right away.

 

And here is just few existing chips that i found that could maybe be possible as replacements (not verified)

H5TQ2G63DFR-PBC FBGA96 SDRAM DDR3 2 Гб
MT41K1G16DGA-125
B5116ECMDXGJDI http://www1.futureelectronics.com/doc/Kingston/B5116ECMDXGnnn-U-v1.3.pdf
EM6HF08EW3A https://etron.com/industrial-dram-pl/ddr3-sdram/

 

Edited March 12, 2023 by diix