This
I thought that too when I first saw the rog expander.
btw as r3e black edition is released after the rog expander, why not direcly put the NF200 on the board, why saying 4 way sli is possible with rog expender, as nobody can find it.
I like asus products but their marketing way, I really dont understand
Thinking about the rog Xpander, I think, I am not an expert btw, but the four PCIE 16x helped and connected by both NF200 are to link all graphic cards directly on rog expander PCB, then connect to the rest of the rig using the PCIE lanes of the X58. Imo