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Enermax uses a six-pin connector for its power cables, but it's only possible to switch connectors around in one direction: PCIe cables actually fit in normal device ports, but not the other way around. That means it's conceivable that a graphics card might be supplied with too little voltage and not be able to do its job properly, but this is unlikely to damage any equipment. A different type of connector is used for peripheral wiring, which delivers 5V and 3.3V alongside 12V leads, so that these connections cannot be inserted into a PCIe receptacle by mistake.
The ATX connector uses a 24-pin configuration in keeping with the new ATX12V2.0 norm, but may be separated into a 20-pin and a four-pin block for use with older 20-pin motherboard sockets. The eight-pin dual-core connector can likewise be divided into two four-pin blocks, so that one of them may be used to accommodate older P4 motherboards if necessary.