Help with radeon 4870

Hi folks! Well, bit of an oops. While doing a repair of my old, but great 2009 Mac Pro, I had to remove the graphic card, it's the Radeon 4870 of that era. That card connect with two wires and oops, I forgot to note, coming of mother board, which one goes where. Thus just need to know one, then the other obvious. So, looking at mother board, two wires come out of it to graphic card, a left and right, as you look in. So, the Left one does it connect to the outer plug on the card, IE,, the plug closes to the edge of card or the inner plug? Looking forward to an answer!

Keith