If you have the latest version of the drivers installed, Enter the Display Properties > Settings tab > Advanced Button > Device Selection. There you have the option of selecting a TV. The TV must be connected via RGB Component cable or S-Video cable directly. Click the identify button to make sure the TV is coming up. Then simply setup the extended displays.
For detailed instructions on how to setup extended displays please visit the link below.
https://www.evga.com/support/faq/?f=59007