The OP would have to buy a different motherboard to SLi, all that one has is a single x16 slot and a smattering of x1.
And solder fumes mmmmmmmmm
Hey want to come over and we can melt down some bar lead for miniÃ© balls! I got the lead melter all fired up and everything!
Protip: When working with a lead melter, wear a headband to absorb sweat. One drop of water + 500g of 350C molten lead = steam explosion.