Best fix is to get another sound card same problems here and a lot more but bf4 is still full of bugs (also sound related) and the phoebus is 1 big bug that hasn't worked from the start they released it
I've been using this card with BF3, BF4, and TS3 without issues. You may want to check the Communications settings in the Sound control panel. Make sure it's set to Do nothing. Also, disable your on-board sound in the BIOS if it applies. If that's not the problem, I'm afraid you may have a software or hardware conflict.
I will return the card if i will not find the solution to the microphone buzzing noise, which occurs louder, when gpu is in stress, and it's independent from drivers.
"which occurs louder, when gpu is in stress" ges what ! you psu is complyte trash. It use same 6pin like you gpu. I can tell this, wth orion stereo headset i have 0 problems in any game or program. Wth 7.1 tiamat , i have many problems.