GTX 660TI SLI or Single GTX 680 ?

[ViperSix]

So GTX 660ti SLI or single GTX 680 i just want the best Performance Games like Battlefield 3 multiplayer ?

What i would like

1. The best performance

2. Highest FPS

3. Beast card

These in SLI
http://www.scan.co.uk/products/2gb-msi-gtx-660-ti-power-edition-oc-28nm-6008mhz-gddr5-gpu-1019mhz-boost-1097mhz-cores-1344-2x-dl-dv

Single Card
http://www.scan.co.uk/products/2gb-gigabyte-gtx-680-windforce3x-28nm-pcie-30-6008mhz-gddr5-gpu-1071mhz-boost-1137mhz-cores-15362xdl

 

[Cons29]

there are times that having sli/xfire is problematic, and of course the heat, power consumption.

in terms of performance, both are good. personally, i will probably go with a single 680