Godofwar,

I have been out of the scene for some time but I believe that the GTX 570 is supported.

You may want to look at codecs first. You said you were using VLC, which is usually pretty good. Have you tried Perian (http://perian.org). Perian has a comprehensive pack of codecs that work with the quicktime. This includes most osx applications, including the quicktime player.

Does the issue occur with all video or certain ones. If it is certain files, check the properties within the player to see what the codec is. I have not run into many formats that that VLC player's codec pack or the Perian codec pack couldn't handle.

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