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1. Set up A is the best electrically. But some motherboards react strangely to having 12V rail always on even when the PC is off. B is most reliable way of ensuring it works properly. C I would not do because the pins can only handle so much power, so your limited by the pins.2. Probably they wanted to used more pins for safety reasons.
1. Set up A is the best electrically. But some motherboards react strangely to having 12V rail always on even when the PC is off. B is most reliable way of ensuring it works properly. C I would not do because the pins can only handle so much power, so your limited by the pins.
2. Probably they wanted to used more pins for safety reasons.
