Maximus / Tesla - does anything for Pr performance?

(sorry if this has been discussed already - couldn't find a thread dedicated to that)
NVidia and Adobe published a few performance comparisons where it seems that Tesla (via Maximus) adds a lot of performance boost to Premiere Pro systems.
Whereas everything else I read (including on this forum) indicates that the gains are primarily in smoother playback (fewer dropped frames in complex timelines), and when the 1st card is relatively weak - such as Quadro 2000 or 4000.
Question 1: have I missed anything? Does Maximus do anything else besides helping with realtime playback. (Please note that I am not talking about any other apps - CS or not. Premiere Pro performance only).
Question 2: anyone tested the Maximum configuration against a decent GeForce card (GTX-670) or, say, Quadro 5000?
E.g. what are the performance benefits of Maximus with Q5K against Q5K+Tesla, for Premiere Pro CS6?
Thanks!
(Here is the stuff I checked before asking these questions:
- Studio 1 Production benchmarking
- http://forums.adobe.com/message/4027056#4027056
- http://forums.adobe.com/message/4207177#4207177
- NVIDIA Maximus and Premiere Pro CS5.52 by Dennis Radeke
- PPBM5)

Alex,
You have to keep in mind that with a single Q5/6K card, all MPE accelerated business is handled by the Q5/6K card, using all the available CUDA cores on those cards. When you move to a Maximus configuration, by adding a C2075 Tesla card, the CUDA cores on the Q5/6K cards are bypassed and only the CUDA cores on the Tesla card are used for MPE acceleration. It is as simple as that.
PR was never able to use multiple GPU's and effectively adding a Tesla card to create a Maximus environment only disables the Quadro card for hardware MPE and leaves it up to the Tesla card. The remaining function for the Quadro card is to steer the monitors. Hence my reservations about this Maximus solution, unless you need 10 bit output to your monitors.
Admitted, I do not know how this works with AE, since AE can use multiple GPU's, so there it may be advantageous.
The nine times performance improvement claimed in the article you linked to are about the same or less than we find in the Benchmark Results.
It is my conviction that memory bandwidth is the overriding factor that determines MPE performance and up to now our benchmark results support this.
If you compare the memory bandwidth of the various cards, you see this pattern emerge:
Video card
Memory bandwidth
Memory Bandwidth in Maximus configuration with a Tesla C2075
Quadro 4000
89.6 GB/s
144 GB/s
Quadro 5000
120 GB/s
144 GB/s
Quadro 6000
144 GB/s
144 GB/s
Tesla C2075
144 GB/s
144 GB/s
GTX 680
192.2 GB/s
Not possible, so it is limited to 192.2 GB/s
This makes it obvious that the fastest solution is the GTX 680. If opting for a Maximus solution, it makes no sense to choose a Quadro 6000 over a 4000, unless you need the memory size of the 6000.

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