1. According the Asus, the ALC 1150 / 1220 is equivalent to their $70 sound cards.
2. Swapping PSUs is no guarantee that both PSUs arte not the problem. If ya swap about one budget PSU for another, it's not likely to change anything. The fact that when ya resteted with the old 770 and the problem still occurs, rules out the new GFX card. In almost every coil whine issue we've had to tackle, a PSU swap eliminated the problem.
3. Complete parts list would be helpful.
4. In addition tot he PSU, I'd also be concerned about the MoBo quality.