I have an Asus HD7850-DC2-2GD5-V2 and I'm running Windows 8.1 64-bit. I should mention that I have the HDMI directly connected to my Samsung LED TV (UN46B6000).
My HMDI audio works just fine during normal system operation. However when I try to play a game like Neverwinter, it kicks into 3d high performance mode and the audio gets choppy unless I lower the in-game render and graphics settings down to 25%. While the problem is present I'll get audio for about 1 second every 30 seconds.
I'm running the latest (13.9) catalyst. I've also tried the beta (13.11). I've also tried using HDMI audio drivers from Realtek.
I've tried tweaking my overclock settings down and up and that doesn't help either. I've also swapped out with a couple different HDMI cables.
I can watch hi-res videos using VLC with no problem, but again this doesn't put the system into 3d mode.
I've confirmed that the problem is with the 3d mode because if I run a game in window mode and try opening up an audio file, the same problem happens. The amd graphics profiler shows the GPU clock at around 800MHz. As soon as I close the game the GPU clock drops back down to 300MHz and audio returns to normal operation.
I've scanned forums here and around the net and while I see a lot of hdmi audio issues but none of the solutions have helped so far.
I've been dealing with this problem for the last year and it's gotten to the point that I've just stopped playing games on the PC in favor of the PS3. But I spent a lot of money for this card and I like the graphics; it just has this one blemish.
This is the second AMD card in a row that I've had something not work right and I'm thinking I'll switch back to nVidia next time.
If anyone has any ideas on what I can do, please let me know.