The ZM-VPM1 can read data from up to two graphics cards with 6-pin or 8-pin PCIe power connectors, and will display not only consumption, but also VGA voltage and current. As for the ZM-PCM1, it can be hooked up to a CPU, it takes up one 5.25-inch bay and is compatible with ATX12V 4-pin or EPS12V 8-pin setups.
Source: TC Mag