None. That's the point. The term 'software' in this context refers to CPU-only processing. Well, this begs the question, then: why market and then include in the software the confusing phrase "Mercury Playback Engine?" I mean, I understand the desire for catchy slogans and stuff that can adorn ad slicks, but if you have access to the Mercury Playback Engine regardless of having an approved GPU or not, why bother? It seems it would be easier and more logical to simply say, "Premiere Pro CS5 is fast. Add a certain graphics card, and it will be even faster." Endusers ultimately don't care about the names of underlying proprietary technologies. Sure, we all love to boast about a certain brand or another that we purchase or use, but "Mercury Playback Engine" isn't a brand. Tell them what they can do to squeeze more performance out of the software, and leave it at that. If Adobe wants to sell more copies of Premiere Pro, simply stop referring to MPE at all, and say, "Right out of the box, you have X; add a specific GPU and you have X+10." PS: Todd, you should probably refer to the Mercury Playback Engine correctly, and not just Mercury... or Dennis will send you a nasty note
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