XLi Technology?
 

DFI have also reported to us that you do not need the additional
PCB bridge, which NVIDIA claims to pump 1GB/s throughput, apparently
this can be run via the board. We are dubious about this, but we are
interested in seeing the performance hit on this change. We know that
the PCI-E bus is capable of running high bandwidth graphics (Alienwares
original ALX video array technology).

Link: http://www.hexus.net/#XLI