For the price you are better off on 2 8800GTX's although FSX is worthless in SLi unless you are running a massive high resolution and 16-32x AA and then its only clarity, not frames
and, the water cooling system shown in that link above is a joke. The Zalman 9700NT will cool a quad better on air than that el'cheapo water system that was old news and really outdated several years ago
nuff said