If your monitor is the same resolution as the TV it may be easier to just clone.
To get sound you just have to set your HDMI port as the default device in the sound settings (right click the speaker in the task bar>playback devices> right click the GPUs HDMI output> select "set as default device").
Do the same to your normal sound device to restore sound to your normal speakers when done (e.g. in my case select Asus D2x).
Asus P8Z77-V Pro, Intel i7 3770K 3.5Ghz, 8GB RAM, Ati Radeon 5770 1GB, CM 690 II. Win7 x64.