Could you give us the complete specs of your system?
Do you overclock your system?
What's your budget?
You don't need a SLI Certified PSU to run SLI and most mid-high range PSU's offer at least 2 pcie power connectors so you won't need an adapter.
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Leclerc
AthlonX2 4600+ @ 3.0Ghz (tweaked by Ebdoradz) | Gigabyte MA790X-DS4 | 2x1GB Mushkin HP PC2-6400 @ 860Mhz | Silverstone Strider 500W PSU | Palit Radeon HD 3850 @ 720Mhz/1.76Ghz on 22" Acer X223w monitor | Thermaltake SopranoRS 101 | 1 x Seagate 250GB
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