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That is true, but isn't as relevant, the power allowance for 5V and 3.3V is the same across all PCIe slot sizes. Only the PCIe 16x slot has a High Performance Mode that allows 75W powerdraw. That is the reason you only see external 12V Molex connectors for risers and PCIe PEG sockets on motherboards that support a large amount of GPU's, 12V is the major limiting factor.
