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I'm sorry if this is another topic. I tried to search for this topic and did not find anything. My question is, I have 2x Nvidia Geforce 8800 GTS 320 Superclocked cards in an SLI configuration. Is there support for SLI in PCSX2? I would think my rig in the signature would be able to handle games in high resolution, but maybe SLI would make a difference?

NO. PCSX2 doesnt support multi GPU

If anything try to force it off for pcsx2 as sometimes SLI can cause unexpected problems.