Just curious but why would you add a sound card when the board already has 7.1 + 2 HD audio built in? Did you disable it before adding the card?
At first I thought a 7.1 sound card was a 7.1 sound card and that's it. So about a week ago I bought a Roccat Kave headset and everyone on the internet suggested that you should buy a offboard sound card to get the full experience. At first I was a bit skeptical, but after so many people suggested it I bought the Xonar D1. I have to tell you, the difference is day and night. It's like comparing a Hi-Fi to a cellphone speaker. I couldn't believe the difference it made. It's awesome!
Yeah, disabled the Realtek one in my BIOS, formatted with the Realtek one disabled and after the format I installed Windows 7 Service Pack 1 and the Xonar driver. Didn't even have my graphics card driver installed at that point, and I got exactly the same result. I've basically tried everything and eliminated all the software variables. Only thing left is hardware. And since the sound card works on other PC's, it has to be my PC. And I read that the P67 and H67 mobos have issues with PCI slots since they don't natively support PCI, they just kinda convert it from PCI-e, from what I can understand. A few people, even on this forum, have said their PCI slots don't work either. So it's kinda obvious that that is the cause.