Elfear, mine was stable/artifact free at 400/1000. Tried 425 but it wasn't stable. But still 1100 was what I paid for so I returned it. If I were you I would keep the GT and send this one back. I am planning on getting a GT.
Elfear, try underclocking the memory and then overclock the core. I had the same problem with my Newgg card. It was failing the test everytime until I underclocked the memory from 1100 to 1000.
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