That is an odd resolution. Are you sure that's correct?
Generally speaking, you really do not need a SLI or Crossfire setup for resolutions below 1680 x 1050. Of course if you are SLI'ing two weak video cards, then that's a different story. However, there is really no point in SLI'ing two weak video cards at all, it's generally better to buy a single moderately powerful video card.