Hey guys, I have a friend from work who has had the weirdest EMI issue. He was only getting it through his front audio port, which you'd think was the issue... so he added a Ferite core to the cable. That didn't solve it. The back port was did not have the issue. It all started after I sold him an EVGA 850w unit. It didn't happen with his old one (on its last legs). It was solved by bending the back panel just a little behind the GPU. Riddle me that, forumites.
Sorry - it was the back of the case, not the panel itself. No grounding issue, I believe. Could be, though.