Another thing to note is that there are some games out there that take advantage of dual monitors, If your into one of those kinds of games SLI is useless as you can only run a single monitor with SLI enabled. I've got SLI on a rig i just built and have only seen 2000 more 3dmarks in 06 and zero advantage in Flight simulator X. both flight sim and supreme commander (the two games i play most!!) are dual monitor friendly and recieve no benifit to sli that i could tell.
Being honest with you, having sli for me is bragging rights and thats about it. luckly it didnt cost me more to have it.
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vista 64 on these rigs
Q9450 @ 3.5Ghz | E8400 @ 4.2Ghz
8gb Muskin Redline. | 2gb Kingston Hyperx
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EVGA 780i FTW ----\--||___||--/---- EVGA 780i SLI
Antec TP Quatro 1000W \ :==^==: / Antec TP Quatro 850W.
Nvidia 9800 GX2 X 2 SLI \|--o--|/ Nvidia 8800 GTS X 2 SLI
1X 500GB Western Digital. \_____/ 3X 150GB WD RAPTOR RAID-0
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