I am also struggling with 1080i. Using a 570 GTX. The problems arise when there is "scrolling" in the film, for example a great test part is the 1080i version of the last episode of Game of Thrones, around 6-7 minutes when the Stark mother is in the woods and you can see lots of trees scrolling infront of her, from left to right. They are jerky and I have yet to find a proper way of making this smooth.
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