H3 has dual DDR chip select so when we routed the board connected both to the DDR package but were not sure if it will work, now when we had prototypes decided to replace the 4Gb DDR3L memory with 8Gb DDR3L memory.
The result was success! H3 booted and show 1GB available memory, this means we can assembly 8Gb memory to next revision of H3-OLinuXino which have two chips and have 2GB RAM on it.
The bad news is that 8Gb memories are very new and their prices per chip are almost x4 times more expensive than 4Gb memory chips (i.e. 1GB made with 8Gb chip cost 2 times more than 1GB made with 4Gb chips).