On my older 6600GT card, when I turned on this feature, it didnt seem to affect my 1080i playback peformance. I think, because its disabled for the slower older video cards.
Anyway, I just turned this feature on for my new 7950GT AGP. When I playback 1080i video, the video is very slow and choppy. I checked my CPU consumption and its not much different than when I have this turned off.
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