Hi there I have 2x R9 290X in CFX and for a while ago my GPUs got coil whine, yes, both of them. I did not have this problem when I got my cards, but got it while after I installed water blocks on them. I had to take them out of the PC and back in again. And then I got it. Also suspect that my PSU got coil whine to. But to my problem When I play games and CF is activated sound from the coil whine is really loud. Game sound is really strange. Loose 50% sound on one ear, and it comes back, but then it happens on the second ear also. Then it comes back with normal sound on both ears. This repeats, really annoying. If I'm on Skype with friends and play games, it's also affected. Sound loss and back to normal, and repeat. But if I play with CF disabled, all sound is normal. Could coil whine from both cards affect the sound card? When I play without CF, it's only coil whine from 1 card and then the sound is normal. System specs: Asus Sabertooth 990FX R2.0 AMD FX 9950 ( stock clock) G.Skill ram AMD R9 290X in CFX ( Stock clocks) Creative Sound Blaster Z Seasonic 1000w Platinum 3X WD Red 3TB HDD Kingston Hyper X 250GB SSD I'm at the stage where I just want to emty my loop and take out one of the GPUs. Or buy a USB sound card and see if this helps. I also live near a small power plant/station, where the wires are about roughly 10 meter away from the house.