from what i understand, there is the ultra-d and sli-d, ( i may be off on the d's or dr's but pardon me), i no that the ultra can be bios modded to be sli, but why would dfi make a product that has 2 pci-e slots, and not be sli?

Who knows, but its a damn fantastic board, lol. DXG dosnt really make sense to me either, i guess its just to make the board a bit cheaper so it appeals to a broader audience.

(and its a hard mod to SLI, not a bios mod)

The Ultra-D SLI mod;

http://www.dfi-street.com/forum/showthread.php?t=10736


Read this about the SLI mod and drivers;
http://www.anandtech.com/mb/showdoc.aspx?i=2337
Basically all the same mother board my guess cheaper tomake.

Native SLI;
DFI LANPARTY nF4 SLI-DR
DFI LANPARTY UT nF4 SLI-DR
DFI LANPARTY UT nF4 SLI-D

Support 8 SATA internal;
DFI LANPARTY nF4 SLI-DR
DFI LANPARTY UT nF4 SLI-DR

i think dfi made a not native sli board exactly like the sli board to save money on manifacturation of those, since the pinout of the chipset is the same, they pnly had to do 1 pcb and i can fit all the original nf4 serie

and that give us the choice to buya cheaper baord (ultra-D) and mod it to SLI and do some blink blink