There is ~375 Ohms between pins A2, A3, B1, B2 & B3 and the 6 pin molex's on the back of the card. Meaning different parts of the card are getting energized in different ways, and the 375 Ohms between A2 & A3, B1, B2 & B3 and the 6 pin molex's is there to prevent part of the card from routing ( drawing ) power through the entire card and damaging other components.

So to answer your question, both get power first while they don't at the same time and the number 42.

I have not personally had any problems, I can confirm that I've read about wires smoking and board sockets melting. I strongly believe that the vast majority of problems related to electrical failures and wire overloads has a lot more to do with poor connections and damaged wires ( internally ). If your card is getting power from a plug that is not making sufficient contact with the psu resistance will increase making that wire hotter thus becoming a worse conductor and the worse the conductor the higher the resistance; a cascading failure.

75W @ 12V = 6.25A



So are you asking why people use the raisers with the additional molex?