I have had this problem for about 3 months. I built a computer with Windows 7 64 bit OS with 650 watt power supply. The problem that I have is that I get screen flickering and the screen freezes with different colours with vertical lines. ( So, sometimes the screen goes grey, blue, green, with vertical lines).
What I did to find out if the problem does actually lie with my gpu is that I gave my gpu to my friend who has the exact same computer spec as me (apart from the gpu, he has a Sapphire ATI 5850 and he has a 550watt power supply). He gave me his gpu.
What happened was that I never got those screen errors when running the Sapphire ATI 5850 , and he never got those screen errors when running the Sapphire Ati 5830! I used the same slot on my motherboard, I connected it in the same way (the two 6 pin connectors from the power supply).
So what I did next was run tests on my memory. I used Memtest and Windiag. All tests that I ran came back with no errors.
What is my problem?? We both ran the same drivers that we normally run, that being 10.8 drivers.


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