Why my iMac doesn't work in Airplay with Mountain Lion?

I am very disappointed because I have a very powerful iMac with 8GB of RAM, a AppleTV2, and I can't use them in AirPlay.
Apple has chosen to not run Airplay on an "old" iMac for not risk a failure .. it is a shame.. they must let me try to work with it..
if not working properly, iMac may automatically disable this function

Reports on other web sites are indicating that AirPlay mirroring, presuming that's what you are referring to, requires Intel's QuickSync hardware compression, something that is not present in older Macs. If that's correct, then it's not by Apple's whim and there will be no way it will ever come to your older system. Third-party options for your system include:
AirParrot-  http://airparrot.com
Reflection-  http://www.reflectionapp.com
Regards.

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