An in the interest of clarity, the one that brings it down to 3.2 volts does so whether or not the other non problematic 2100 is plugged in or not. Meaning one specific module bring down the voltage, the other one seems to be fine. If that unit is in by itself, it still brings down the voltage, and that in either socket.
But back to my other post, with only one driver it seems to not function, even to the point of making eqmod become unstable.