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Warry, That potentially is a very misleading statement. The encode performance of a particular project is very much tied to the features incorporated in that project and hence not a good reflection on various encoding technologies as standalones.
Thanks Jeff for your reaction, and I can of course to a large extend agree with what you write.
What I try to keep in mind is that in this forum we are discussing these technologies whilst using PowerDirector that executes previews and productions with these technologies. We have seen that ALL the parameters,like CPU, GPU, diskdrives, drivers, settings, the PD version, and also the specs of the source video material, the changes we apply to that material, etc. etc. have a certain influence on the speed, quality and swiftness of the software. The Optodata tests results differ per driver!
A full test to compare the encoding and decoding capabilities of the technologies would be very interesting. The outcome may likely be (as you rightfully write) a gain of 50% to transform a video from A to B. But what if we apply effects and all the other things we need to get the video we want? And what is the advice to people who want to know what kind of computer they need for video editing?
My conclusion would be, that GPUs make a difference for video editing. That depending on the equipment used and the "effects" applied,
in general there might be a speed gain of about 10-20% as the Optodata tests show, and there may be peaks as high as 50% as your tests show.
Hope that this makes sense.