I recently got a gt 640 gigabyte oc edition, I installed it in the pc and everything worked fine until I noticed on my desktop that there are transparent moving lines. I reinstalled the drivers, still the same, changed the vga cable, still the same, changed the monitor, still the same.
I switched back to my old gpu and everything works fine and no screen flickering. The weird part is that I tried the gt 640 on the tv with an hdmi cable, and it works with no problem, my tv also had an vga port, I tried with that too, works no problem. So I cannot identify the problem.
I did not find the right solution from the internet.
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