There isn't much that can go wrong with that type of card apart from a manufacturing fault. If it was me, I would get it replaced.
The only other thing it could be is the possibility that your PSU isn't good enough. Can you have a look at it's label for it's make, wattage, and amperage on the 12volt rail(s). You will need to remove the side to see it I expect.
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Nearly a Posting Maven
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