I’m having trouble with the blender rendering systems. I can only render smooth video under 30% 1080P, other wise it is very choppy. Here I have a AVI Raw format 720p video. I just built this computer, 3.2 GHz quad processor, 32GB of ram with a 64-bit OS, and a galaxy GeForce gtx 660ti video card. I’m using the blender 2.64a 64-bit version. What is the problem with it.

Here is a cube I moved just to show you what is happening. I compressed the file with WinZip, so it will need to be unzipped.

http://www.mediafire.com/?1skty5p8y8y26y7
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