Got some bad news guys. I was reorganizing one of my Titans which has been running non stop for about 5 days when I noticed that the PCI-e socket on one of the cubes is already starting to burn:
I am using dual Seasonic 1250W PSUs for each Titan which have pretty high quality cables. I didn't start seeing any signs of burned sockets on my Neptunes until around the 2 month mark so I am getting concerned about these Titans.
Stock PSU cables aren't not, let me repeat, ARE NOT pretty high-end cables. They don't even start to come close. You need to buy 16AWG cables from this guy.
http://www.shakmods.com/shop&&#!/~/product/category=3316088&id=37642162
Those are "HIGH-END" cables. The fact that the cables started to melt at the cube end suggests they were plugged in correctly or they simply are cheap quality cables.