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To properly run Premiere CS5 you need one nVidia CUDA card with at least 1 GB of video RAM to take advantage of the Mercury Playback Engine (MPE). MPE does not take advantage of a second card. Some people use a second card for additional monitors, but the most common usage of another PCIe x8 slot is for a RAID card. Do not get an ATI card! More CUDA cores and more RAM give improvements but they may just be minor compared to the basic card which is a major difference take a look at our Premiere Pro BenchMarks (PPBM5) .
For a list of supported nVidia CUDA cards go to the FAQ
For others, the nVidia Hack http://forums.adobe.com/thread/629557?tstart=0 - which is a simple entry in a "supported cards" file - IF the card meets the minimum requirements mentioned above
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To properly run Premiere CS5 you need one nVidia CUDA card with at least 1 GB of video RAM to take advantage of the Mercury Playback Engine (MPE).
I think that sentence will cause less confusion and better make the point if you take out the first five words.
CS5 will 'run properly' with pretty much any video card. It's only hardware acceleration that needs a CUDA card. And I'm confident there are plenty of people out there running Premiere Pro just fine without hardware acceleration.
Very clear for me...thank you all...