This problem (jagged edges/flickering lines) started on my computer after about 3 weeks I bought it . I clearly did not have any issues with my system. I installed lots of games but didn't have any problem and this suddenly started. (tbh maybe it was there all the time from beginning but I didn't noticed).
I searched on google to find a solution and I was extremely disappointed! there is not a single possible solution for this. I have read all 98 pages of NVIDIA forums and many other forums as well. but sadly the truth is there is no possible solution at all.
To me, it seems that this issue is because of limitations of technology. This means maybe we are judging too early and have to wait a few more years until new technologies come out with new hardwares and game engines and these problems will be all fixed.
The reason I believe that is because this problem is not only happening to NVIDIA graphics card but also happening to all other cards by different manufactures. In case you didn't know, this problem also has been happening on all consoles. but the fact is most people don't realize it and get over it. but some people like me, can't play the game with these jaggy edges and flickering lines.
Here is a video of GTA V on console back in 2013:
As you can see from that video, you can clearly see lots of jagginess and flickering lines all around objects.
But as technology gets better, these issues have been addressed and solved (almost). I hope people can understand that.
I even noticed jaggies edges in some advertisements when I was in cinema last week. There was an ad about a car company that they had jaggies all over their vehicle. I don't know how they rendered it or maybe wanted to enhance colors or something or add animations but me and my friend could clearly see all those flickering lines and jaggies.
Now surprisingly I noticed jaggies on NVIDIA official video! YES! I am not even joking. Today I suddenly saw a video by NVIDIA official channel on youtube introducing new GTX 1080. And even in their own video I could clearly see jaggies and those flickering lines. I mean man this is everywhere!!
Just take a look your self. at 0:40 in that video look around the fan circle you can see how jaggy it is and how pixelated it is clearly!!