DFI's been up to some aftermarket "trickery" with their SLI implementation. The gang at Hexus has dug up some info on what DFI is calling XLi, incorporating the ability to select between single or dual graphics cards in the mobo's BIOS.

"In our extensive SLi coverage we showed the bridge ‘PCB' connector and the physical 'SODIMM' selection PCB. This allows the user to select single or dual graphics cards. Over the past few years we have seen more and more migration from hardware based tweaks to BIOS integration so this sudden reversal was a surprise to us."