Bitstreaming with Nvidia gtx460

[srinivas1015]

This is my current configuration:

Windows 7 64bit
Amd athlon X2 dual core processor(2.7 ghz)
Nvidia Gtx465
8gb Ram
Samsung Blu ray drive
Nvidia IR 3d vision

Onkyo HT-RC270 Receiver, Polk 7.1 tower speakers and subwoofer
Optoma HD67 Projector

Cyberlink Powerdvd 10 Mark II Ultra Max, Powerdvd 11
Arcsoft Total Media Theatre 5

I'm planning to replace my existing gtx465 with the gtx460.
I want to bitstream HD lossless audio from my PC and use 3d at the same time. It is 720p 3d.
I will be using one port for the video to my projector and another other port for my audio to my receiver.
Is the Gtx 460 capable of doing this with the above software?
Do I need to buy a mini hdmi to hdmi cable or can I use a Dvi to hdmi cable for audio?
How does the gtx460 compare to my existing 465?

It bitstreams the audio for my receiver to decode right?

Please help me out.Thanks