Also I want to know if we have ultra low cost Chinese DDR manufacturers? do you happen to know some? what brands for DRAM's do you suggest that have low prices?
DRAM market is an oligopoly with 3 suppliers: Samsung, Micron and SK Hynix.
Chinese companies do not have a required know how for DDR4 production with sufficient performance and yield, to be competitive to D3 group in any way.
To make 1K SODIMM we need to buy 10K DDR parts, which is a good starting point.
Go ahead, $50K is not that much money to loose.
PS do not forget, that you will also need following:
- high density multilayer PCBs with gold fingers, EEPROM chips, termination resistors and caps
- assembly service that can handle BGA chips
- test jig and test software for DRAM Modules (you need to determine correct SPD settings and write them into EEPROM)
PPS just to avoid possible confusion:
DRAM chips are usually marked in bits and not bytes. With eight 4Gb DRAM chips you can build one DRAM module with 4GB size.