How can I tell if my Mini DisplayPort outputs sound?

I bought my MacBook Pro 5,5 in 2010 but I don't remember when exactly. I can't find anything about the Mini DisplayPort info in System Profiler.

Hi m,
mollymoon88 wrote:
If you have a mini display port on your mac than it does support audio out but you have to use an hdmi cable as mini display port to dvi and all other besides HDMI don't carry the audio signal through. Just make sure you are using HDMI and it will work out.
That is only true of MBPs produced since April 2010: http://support.apple.com/kb/HT4241

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