From my experience recogintion of hdmi audio is not connected to recognition of graphic card, correct me if I'm wrong.
So we have a proof that with 12c54 build (normal 10.8.2?) the gtx660m is correctly recognized (even with 2GB RAM), and newer iMacs and 10.8.3 could help nothing in this manner.
The key maybe is in DSDT as always, maybe famous user "bcc9" could help us debugging the problem - see amd or dell xps guide from him.
New iMac 2013 nvidia driversnvidia drivers
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