MSI has gone so heavy with 12V-2x6 power sockets in its latest high-end PSUs that many AMD and Intel graphics cards have no way of being powered
The only reason why anyone would want to use two 12V-2x6 cables is to have a PC with two Nvidia graphics cards but given that ...
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Per-Pin Sensing in GPU Connectors Prototype 12VHPWR Connector Design
In theory, every current pin can supply up to 575 watts, which is important for powering the GPU efficiently. However, problems can occur if the cables are cut internally or not seated properly.