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just to rule out the driver issue, d/l the latest nvdia driver candidate - v41.xx which was released ealier this month and delete the card from the device manager, reboot and install again.
the corruption you describe reminds me of an incident i saw a while back where the card conflicted with some system memory settings.
it is starting to sound like indeed a hardware problem. if you are able to borrow an identical card from a friend,etc swapping it out would provide a conclusive answer.
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