GTX 680 Performance Increase?

I currently have a EVGA GTX 680 Superclocked Signature Edition-GPU
I play on 1080P resolution
I play most popular well rated games and want them to be played on ULTRA with no exceptions unless absolutely required.
Thinking about throwing another GTX 680 (same model) inside my PC will I see an increase in performance while gaming? My first time ever building my own PC or owning a gaming rig.

I ran GTAIV with ENB graphics mod at max settings and draw distance, detail distance, and vehicle density maxed. Ran the benchmark test and only was getting 18 FPS. Will a 2nd card improve this?

Will my SeaSonic X-Series 850W PSU put out enough power to run both cards?

CPU: i5 3570k
Cooler: Hyper 212 EVO
MoBo: ASRock Z77 Extreme4
GPU: EVGA GTX 680 Superclocked Signature Edition
RAM: Corsair Vengeance LP 16GB (4x4) 1600
HDD: Seagate Barracuda 1TB 7200 RPM 64MB SATA 6
External HDD: Western Digital 1TB (speed unkown (old))
SSD: (1) OCZ Vertex 4 128GB (2) OCZ Vertex 4 256GB
PSU: SeaSonic X-Series 850W 80 Plus Gold Full Modular
Optical: ASUS DRW 24x DVD Burner
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  1. Your PSU can power than config and you will see good performance gain but porbably not in GTA as it is coded horribly. It might not like Dual Gpu's at all.
  2. yeah for the psu.....for the sli i dont know much...i only know that sometimes works sometimes not,and that some games dont benefit from sli.....also i think that for a single monitor on 1080 a 680 is more than enough....
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