I think what linux is saying is that having 2 psu's is not going to polish a turd.....if a card is doing 1150 it probably sucks and 1 PSU is enough.
As far as SF3D using 2 PSU, its preety simple, thats a multi rail PSU with XX amp limit per rail. Maybe he wanted to dedicate each PSU's rail to one power connector on a card.
Seems it would make more sense on a single rail PSU though if you wanted to increase amperage though.
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