3+1 Displays?

Greetings, [H].

I have a question I'm hoping the community can help me with.

My GTX 670 has four outputs connected to the following displays:

1. DVI > 24" 1920x1200 Dell (desktop)
2. DVI > 24" 1920x1200 Dell (extended)
3. DisplayPort > 24" 1920x1200 Dell (extended)
4. HDMI > nothing

I would like to attach my 42" LG TV to #4 and have it duplicate #1 so when I play games on my PC, I can turn on the LG.

I think I can simply attach the LG and then in the Multiple Displays pull-down in display properties, I can tell it to duplicate the desktop on 1 and 4.

Has anyone else done this? I would like to be sure its going to work as desired before I go through the hassle of moving displays around and running the HDMI cable.

Thanks!

You'll be limited to 1920x1080 on the 24'' Monitor unless the TV takes a 1920x1200 signal.
Mirroring works as you described but both monitors will need to support the same resolution.