Hey.
Me and my colleague are running a mining rig with 2x PowerColor R9 280X, 1x Sapphire R9 280X OC Dual-X and one MSI 5850 on a motherboard with a FX-8350.
We run all 280X's on 1020/1500, which is the default for the Sapphire card. The PowerColors has been undervolted but the Sapphire wasn't stable at lower volts so it runs completely stock.
If we try to overclock the Sapphire even to 1030 it hangs the rig, so we just run all at 1020/1500 and get about 723Kh/s each and a temperature at about 83°C @ 40-60% fan speed.
So now to the story: Today I noticed that my teamviewer had disconnected and the computer was shut down so the WoL didn't work, I jumped in my car and went to my office to find the computer completely shut down. Nothing looks suspicious so I just press the power button about 4 sparks fly from the back end of the Sapphire card and it smells burned. I take it out of the rig and start it up with just the others and there doesn't seem to be any problems.
So the quetion is, is the Sapphire completely fried? It has only been running for roughly 9 days and all the time it has hade good temperatures.
And an image of the rig before we fitted the 5850 just for the ones that like images