A monitored device is used to monitor power parameters of a memory bank of a computing device. The monitoring device includes a main circuit board, a connector, and a parameter monitoring device. The parameter monitoring device comprises an acquisition unit, a processing unit, and a display unit. The main circuit board is connected to a power supply and providing power signals to one or more power pins of the memory bank. The connector is connected between the main circuit board and the memory bank. The acquisition unit acquires a voltage passing through each power pin of the memory bank when power is supplied to the memory bank. The processing unit processes the voltage acquired from each of the one or more power pins to obtain power parameters of the memory bank. The display unit displays the power parameters of the memory bank.