HDMI from DisplayPort

I have a MacBook I bought late 2010, how do I know what mini DisplayPort revision it is (1.1 or 1.2)? Also, how do I know if it supports audio out when using an HDMI adaptor?
Can anyone recommend any good mini DisplayPort to HDMI adaptors? I would love to get one that supports HDMI 1.4 but can't find one.
Also, if using the right cables, can I even succeed in outputting things like 5.1 chanel surround sound or 3D or full HD (or higher) video, or can the DisplayPort hardware not do that?
Thanks.

That particular cable might not conform to the VESA v1.1a DisplayPort Interoperability Guidelines. There's some information about that sort of audio issue in the following document:
About Mini DisplayPort to HDMI adapters

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