In a method and system for transferring power from a first subsystem to a second subsystem of a computer via a Newcard device, a first port of the device having a first connector is used to electrically connect the first subsystem to the device. The first connector includes at least one pin terminal to transfer the power and at least one pin terminal coupled to an SMbus of the computer. A second port of the device having a second connector is used to electrically couple the device to the second subsystem. The second connector includes at least one pin terminal to transfer the power. An identifier stored in the device is read by the first subsystem to uniquely identify the device. In response to the identifier, the first subsystem controls an amount of the power transferred to the device.