Solder doesn’t increase performance (the memory is soldered to something regardless, either the main board or an expansion board), but shorter physical distances mean lower latency and less power to transmit the same data. LPDDR4/5X are designed to take advantage of this additional efficiency.
It would seem to be rational that the less mass of metal in a connection, the faster that connection will charge or discharge voltage. Physical sockets require a lot more mass just to ensure solid contact.
My knowledge of electrical engineering has not shown that solder increases performance. Do you have some more information on this?
Solder doesn’t increase performance (the memory is soldered to something regardless, either the main board or an expansion board), but shorter physical distances mean lower latency and less power to transmit the same data. LPDDR4/5X are designed to take advantage of this additional efficiency.
It would seem to be rational that the less mass of metal in a connection, the faster that connection will charge or discharge voltage. Physical sockets require a lot more mass just to ensure solid contact.