Hardware Acceleration Disabled
Switching off PowerDVD's hardware acceleration option pushes CPU load to 100% with visible frame dropping and tearing on both ATI and NVIDIA cards.
Hardware Acceleration Enabled
Even with ATI AVIVO acceleration enabled, CPU load is still at the high 75% range.
NVIDIA PureVideo HD acceleration offers the same decoding performance as ATI AVIVO in this scene. In this scenario, both the Radeon X1650 XT and GeForce 7600 GT are on par.
True Blue (H.264 encoding at 1080i)
Video and Audio formats for True Blue HD DVD title.
Hardware Acceleration Disabled
Even with a lower 15Mbps movie, H.264 is still too much for our Core 2 Duo E6400 to handle without ATI AVIVO or NVIDIA PureVideo HD help. CPU loading is 100% with apparent frame dropping.
Hardware Acceleration Enabled
With ATI AVIVO acceleration enabled, CPU load lowers to an average of 70%.
With PureVideo HD enabled, CPU load is reduced to a bearable 61% on average.
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http://www.hardwarezone.com/articles/view.php?cid=11&id=2161&pg=3