The Graphics that support the SLI technology doesn't mean that it need two Slots to Operate .
Actually the SLI technology based in Operating two graphics that supports SLI to have dual graphics card with dual GPUs.(Which leads to Dual image processing power).
And ofcourse to operate the SLI technology You need a MotherBoard that supports SLI .(I advice You to go for the NForce series for this purpose).
-And about which graphics card is best i think that 8600GTS is better.
But I advise you to get 9500 GT since its a budget card and About the same, Just make sure you get DDR3 and not ddr2. Big difference in gaming.
(That 's my opinion).
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