I suggest to get an another 9800GX2 and overclock after that.
Originally Posted by sgdude
yes 1 9800gx2 will destroy 2x8800gs, in modern card terms its like 2 downclocked GTS250s in SLI.
i would advise against selling it, the gx2 has gtx 285 like perfromance, so no single gpu card will really be an upgrade, and the gx2 is the folding king. keep the GX2, its enough for anything right now.