tbh i'd run them in the first and last to allow the top gpu to breath, I found it to be much more worth it. I only lost a couple of frames going from a 16x slot to a 4x slot, and the top gpu dropped by about 15C.
What board socket do we talk on ?
- That will help a out, my Asus Rog Formula 2011 socket have 1 and 3 to 16 all the time, but i know it does not work like that on 1155 or 1150 boards.