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NVIDIA PureVideo HD with HD-DVD Quick Shot
November 01, 2006   Alan Dang > [View My Other Articles]
Product Info | User Reviews | Article Images(19) | Image Gallery | Comments | Forum Thread
Performance and Conclusion


CPU Utilization on Core 2 Duo E6400
PureVideo-enabledCyberLink software-onlyCoreAVC software-only
Swordfish (VC-1)34%48%
Virtual Trip: Yozakura (H.264)73%Failed (choppy at 100% utilization)Failed (no AACS)
True Blue (H.264)58%Failed (choppy at 100% utilization)Failed (no AACS)
Broadcast MPEG-2 1080i3014%22%
Broadcast H.264 1080p2534%63%53%


Conclusion

While HD MPEG-2 and HD VC-1 can easily be handled by a modern Core 2 Duo, H.264 represents a substantial challenge. Even with the lower-quality broadcast H.264 sample, CPU utilization was already 63% on a Core 2 Duo, which probably the fastest SSE3 performance clock-for-clock. When it came to high-bitrate H.264, the CPU-only solution was inadequate. With H.264 likely becoming the preferred encoding CODEC for future Blu-Ray discs, clearly GPU-accelerated performance is needed. While CoreAVC has a reputation for high-performance H.264 decoding, it still wasn’t a match for PureVideo HD hardware. While we were unable to test CoreAVC with HD-DVD content due to AACS content restrictions, it seems unlikely that you will b able to play an ultra-high bitrate video clip such as Virtual Trip: Yozakura on even a Core 2 Duo Extreme.

Although we haven’t looked at picture quality in this article, it’s important to realize that while MPEG-2 decoding is easily handled with today’s CPUs, GPU-based decoding is still important from a picture quality perspective. To date, there are no software solutions that can provide high-quality content-based inverse telecine of 1080i sources. With hardware supporting content-based inverse telecine of 1080i HDTV, virtually every scripted high-definition TV show broadcast as 1080i60 can be reconstructed into the true 1080p24 image.

What about ATI’s performance? We’ll have those numbers for you in the future. Likewise, it will be interesting to see what sort of bitrates are going to be found in the upcoming H.264 Blu-Ray discs.


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