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Sounds like the temperatures you are getting may be the problem. 93 degrees is extremely high for a graphics card.
Do you still own the Gigabyte Pro Odin 800W power supply that you have listed? If so, you have plenty of power available, so I don't think your power supply is the problem.
I would highly recommend lowering those temps. Once you get to a reasonable level somewhere around 70 to low 80's you shouldn't have any more problems. If you have any overclock applied to the card, I would lower it back to stock clocks and see if it makes any noticeable difference in your temperatures.
update: ok after done a few test on benchmark....it seem i need to manual set the fan speed to 40-47% in order to stable the temp between 85-90C in gaming....and yes i still using Odin 800w PSW....i dun think is my PSW problem....
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Does your power supply have separate rails? It can be poor rail power distribution, I had a shutdown issue in metro 2033 with a 7970 and an ocz stealthxtreme 600w and besides cpu and pci-e being on the same rail, the wires were shared between the two pci-e headers.