Hello again, Dominik.
I recieved the "new" card today, and immediatly put it in, to test it out.
I am baffled by the results.
What happend with the first replacement card, seems to be happening again; which of course leads me to belive maybe it's my other componenets that are failing. I putted the card in, removed my old drivers and AMD drivers, rebooted and installed Nvidia drivers, restarted again.
I then launched Valley Benchmark, while having Afterburner and GPU-Z open. Everything at stock. Half way trough Valley Benchmark, the screen would go black 2-3 seconds, recover, give me an error with the program, while the driver stopped working.
Anyway, i went on and thought maybe the program just isn't working properly. I fired up Furmark, leaving the fan at 80% to avoid any dangers there. At about 15% into the Burnin Benchmark, the program shut down, reporting the driver stopped working. It also left an error message, which led to Nvidias site.
http://nvidia.custhelp.com/app/answers/detail/a_id/3007
From that link, im unsure as to wether or not the problem is the graphics card or not. I dropped my motherboard back to stock, and did it all again. Valley crashed once again, this time, causing the PC to restart, 11% into Furmark, the same message appeared again.
I hope to have a different motherboard and PSU to test it with by the end of the week..