I think you’ll be fine with that set-up. I’m running a Core i3 2100T an a DH67GD motherboard and while I haven’t bothered making sure everything can bitstream audio, the HD works great, and bitstreaming the audio should work if I configure it.
You might find some useful information in this guide: http://www.missingremote.com/guide/bitstreaming-hdmi-hd-audio-formats-your-htpc
It doesn’t have the latest generation of GPUs listed, but they should all be capable of bitstreaming audio.
