Asus Xonar DSX has dts surround over optical. And 24 bit-192khz support for flac files. That's the exact card I was using before I bought a Sony STR-DN1040 hdmi receiver. Now I just go hdmi from my gtx 770 straight into the sony.
I use dual link dvi into my main 32" monitor. But then I have a separate small little 20" hdmi monitor just hooked directly to the Sony for when I need to adjust the sony menu settings (which is very rarely). I leave that monitor off 99.9% of the time.
That's kind of what I'm looking to do now.
I'm currently switching between having Creative's DTS connect program to encode the output of my X-FI to a 5.1 DTS signal (meaning I can use all the control panel features like Smart volume management for night time), and having it go through my Gfx card, but i am having a few issues with both.
Is there a way to just send the audio signal through HDMI without sending a video signal? My resolution is 2560x1080 which isn't standard for this receiver. It either does 1080p or 4K. Meaning basically if I switch the HDMI channel on or restart my computer, the desktop will change to some obscure 1024x999 resolution and all my carefully arranged icons will default back to one side. Also I can no longer run it at 85Hz.
If I use the soundcard, I occasionally have to switch the DTS encoder off and on again to stop a clicking noise in one of the speakers. The other issue is that when DTS is encoding, the volume is significantly louder, loud enough that it causes distortion in some music because it's overloading the card's pre-gain levels. I have to manually change each application because the main volume control no longer works.
I'm thinking of trying one of the Xonar cards in my next build, I'm hoping that I'll still be able to use some kind of volume management feature that compresses the sound dynamically (makes the quiet bits louder and the loud bits quieter) for the night when my housemates won't appreciate sudden bangs.
I am also wondering if the Xonar range can output stereo tracks on all the speakers without changing the sound, like creative does with the Stereo Surround upmix feature in CMSS-3D. I know the latest Creative cards don't have this and because my amp thinks everything it is getting is a 5.1 signal, its upmix feature is no good unless it is receiving a stereo signal.
Edit: one final query, if I have an HDMI lead going from my graphics card to the amp, and then another into the spare HDMI slot in the back of my monitor, how do I stop the sound being passed through to my monitor (which has no speakers) and is there a way to choose which output my graphics card defaults to during post? currently HDMI seems to have priority so I get a black screen until the windows logo. I would prefer if it were Displayport.