Hi All here is a video that clears up some confusion of the different PCIe lanes and their performance
the results are surprisingly good
http://youtu.be/rctaLgK5stA?list=UUXuqSBlHAE6Xw-yeJA0Tunwand more info sli scaling
SLI Performance Scaling - Gaming at 4K Resolution
http://youtu.be/UnS0xWtoRzk?list=UUXuqSBlHAE6Xw-yeJA0Tunw