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New self-built computer, worked fine, lost power once, now intense gaming creates GPU artefacts

Alright, so I finished building this PC friday. Here's the build : http://ca.pcpartpicker.com/p/1UoPJ

I was playing a very GPU intensive game after I was done installing all the drivers and Windows, the whole computer was running fairly cool (CPU wasn't going over 50c, GPU not over 80) I've ran Far cry 3 no problem for almost 2-3 hours non-stop.

Then, I lost power. Suddenly, now after intensive gaming or long session of mid-intense gaming, vertical lines of two different color swap all over the screen, and the GPU crashes completely, and I need to manually reset the computer. When it comes back on, everything is normal until I do another gaming session.

My GPU is a Gigabyte Radeon R9 280x
PSU is a Modular CX600M
Processor is an i5-4670k
8 GB RAM

What might be causing this? Is my GPU damaged?

Update: Putting my screen display to 60hz has reduced the likeliness of the GPU crashing.

Update 2: Underclocking the graphic card seems to be the best way to reduce the GPU crashes.

Update 3 :
Okay, I did a furmark test (It test videocards)

I underclocked my card to 75 %, and it survived a 1080 2 minute test.

When I did not underclock my card, it crashed, and my screen was showing this before the PC shut down : http://filesmelt.com/dl/IMG_20131111_2341531.jpg
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More about built computer worked fine lost power intense gaming creates gpu artefacts
  1. Best answer
    Try reinstalling the drivers. If that doesn't work, try lowering the core and memory clocks of the GPU.

    I would imagine that your power supply could be damaged, so I'm trying to rule out other possibilities. Do you have another PSU laying around?
  2. Reduced the Monitor's refresh rate to 60Hz, hasn't bugged out since.

    I have another PSU, but it's underpowered and will not supply this machine correctly.
  3. I still have not found the root of the issue.
  4. What cable were you connecting the GPU and monitor with?
  5. it's a DVI cable
  6. Is it dual link?
  7. Okay, I did a furmark test (It test videocards)

    I underclocked my card to 75 %, and it survived a 1080 2 minute test.

    When I did not underclock my card, it crashed, and my screen was showing this before the PC shut down : http://filesmelt.com/dl/IMG_20131111_2341531.jpg
  8. That usually points to a defective GPU, possibly a bad power supply, assuming temps were good.

    What were the temps when this happened?
  9. 70 Degrees Celsius, maybe 80 at max.

    I've already asked for a RMA exchange. I've put another (although inferior GPU) in my computer and there hasn't been any issue since.

    You've been very helpful, so thank you.
  10. No problem!
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