Download EVGA Precision online or on Steam and downclock the card by 200mhz in both core clock and memory clock. The reason for this is I believe your card could be unstable and this is a quite common issue. Another thing is if your over locking you CPU, then that could be the problem also. Other things you could try though is making sure all the cables are nicely and hopefully other people chip in too.

But deffinitly try the downclock because it generally works for crashing and then you can get an RMA or EAR and get a new card that doesn't do that and runs at its default clock nicely.

Sajin
Sounds like a faulty psu. Replacing your current psu with a higher quality unit should fix the issue.

Yep yep