The product page for AirPlay states that advanced hardware acceleration is used to make mirroring to an Apple TV possible. The footnote shows that only Mid 2011 Macs and newer can use this function. The graphics capabilities of many recent Macs are very capable, so has anyone figured out what exactly is being done or required of the hardware to do this sort of network mirroring? (Might the GPU be handling the encryption for the OS or some other very new feature of a graphics system?)
MacOS – What GPU functions or capabilities are behind AirPlay mirroring
airplaygpumacmacos
Related Solutions
You could give OpenMark a try.
OpenMark is an OpenGL benchmark for Mac OS X. OpenMark tests the raw speed of the video card drawing a variable (automatic or user-defined) number of triangles and generates a screenshot and a text report of the results.
With the new OSX Mountain Lion you will be able to airplay from the Mac to an Apple TV.
http://www.apple.com/macosx/mountain-lion/features.html#airplay
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Best Answer
There's some misinformation going on at the moment on what exactly is needed for Macs to support AirPlay Mirroring. The cultofmac article correctly states direct access to the GPU for H264 encoding but this is supported on Macs older than the one's listed to support AirPlay Mirroring. So this isn't the main requirement.
The really important feature to make AirPlay Mirroring work is Intel's QuickSync baked into Sandy Bridge CPUs. And only the newer devices listed by Apple have that. So the main requirement for AirPlay Mirroring is a specific CPU feature, not GPU.