I'm doing some research on ASIC miner hardware and would like to know what materials the hardware is actually made of. What I have already found out is that there are quite a few chips on one hashboard and that there are several hashboards. But for the specific ASICs I'm interested in (S19, S19j pro and S19 xp) I can't find any specific trustworthy info on the number of chips, number of hashboards and especially the chip size/DIE area. All I know is which chips are installed in these devices. Does anyone know of any trustworthy or less trustworthy sources?