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GeForce 6800 Ultra and Radeon X800XT H.264
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Forum Regular
Join Date: Apr 2001
Location: Tokyo, Japan
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I own a Radeon X800XT AGP in my G5 and, a few days ago, had the chance to try the GeForce 6800 Ultra from a friend.
The performance of the two cards is basically the same. However, I was surprised to see that the GeForce seems to display H.264 High Def movies better.
For example, when viewing the following movie in 1080p:
http://www.apple.com/quicktime/guide...lleryreel.html
The Radeon stutters briefly a couple of times during the movie, but the GeForce keeps displaying at maximum frame rates.
Does anyone know why the GeForce should perform better than the Radeon for 1080p movies?
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Dedicated MacNNer
Join Date: May 2005
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Other than the fact that it's twice as big and generally regarded to be more powerful (especially in video intense apps such as Motion)?
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Posting Junkie
Join Date: Oct 2005
Location: Houston, TX
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I'm surprised you noticed a difference in video playback... that's usually CPU bound and doesn't involve the GPU. Only the newest generation GPUs (X1 series from ATi) accelerate H.264 playback.
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Junior Member
Join Date: Jun 2005
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That's strange...never had any problems with sttutering with any of the videos and i have a 9650...
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MacBook Pro 2.4 17 HD
ACD 23
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Addicted to MacNN
Join Date: Jan 2003
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Originally Posted by MovieCutter
Other than the fact that it's twice as big and generally regarded to be more powerful (especially in video intense apps such as Motion)?
Not sure that the twice-as-big aspect has anything to do with anything. My Apple ][+ is over twice as big as a Mac Mini....
The nvidia GeForce 6800 Ultra does hold a small edge over the X800XT in Motion (according to published benchmarks), but the X800XT is less expensive, and still faster than the more common 6800 GT.
Either way, not sure why you'd have some studdering playing HD video with the ATI. I have an X800XT in my main machine, and don't have any trouble at all, even with 1080p blown up to fill the Apple 30" display.
May have something to do with drivers perhaps. Do you have the most recent ATI retail software & drivers installed? But, as mduell said - neither card do any H.264 acceleration, so its all CPU.
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Forum Regular
Join Date: Apr 2001
Location: Tokyo, Japan
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Thanks for the replies.
I have the latest drivers, so I guess the problem is elsewhere in my setup and not video card related.
It'll be interesting to see if 10.4.4 improves video drivers again...
By the way, does the GeForce 6800 Ultra not include a on-board video processor? What is it for?
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Moderator  Join Date: Apr 2000
Location: Gothenburg, Sweden
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Decode MPEG2 and Windows Media 9 streams, offloading the CPU. Not so sure that the OS X drivers support that though - it took nVidia 8 months from the release to support it on Windows, after all. It also seems that the 6800 Ultra (and GT) shipped with a version of the Video Processor that is less capable than the regular 6800 - at least according to Anandtech:
http://www.anandtech.com/video/showdoc.aspx?i=2305&p=11
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