I have a similar spec PC to you mate and the same GFX card. I also had the artifacts, its all to do with how yer card is set up. There's a thread somewhere which reccomends using nHancer and supplies some values. I did this and it seemed to work for the most part, did a little bit extra tweaking and hardly ever get them at all now. Not sure what I tweaked but I'll export the settings and post them here if you like.
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