I guess not. PR CS5.5 and CS6 only support a single GPU, no SLI and no dual GPU. The only exception is the Maximus configuration, a Quadro plus a Tesla C2075 card and you don't need to spend additional money on a Cubix GPU Xpander, since both cards fit on most of the X79 boards.
BTW, I'm curious to see if the extravagantly expensive Maximus configuration performs any better than a simple GTX 680, that costs only a fraction of the price.
Cubix's website says "GPU-Xpander is an ideal hardware add-on product for CS5 because:". So I was wondering how this is so?
Also, with regards to your question of GTX 680 vs Maximus, the only issue here is that "system smoothness" is not quantifiable.
It may not have the top-line rendering performance, but a Maximus system may allow you to scrub the timeline smoother with a bunch of effects for instance.
Till proven wrong by test results from Adobe, I consider Maximus a huge marketing hype and only a solution for companies with unlimited budgets (few of them around anymore, due to the financial crisis) and individuals like Bill Gates or Warren Buffet, with hugely deep pockets.
Simple, a Quadro 6000 for a meager € 3900 does not perform any better than a GTX 470 for € 237.
Adding a Tesla card for only € 2300 to the equation means that the Quadro 6000 is no longer used for hardware acceleration, that is a role solely for the Tesla card and the number of cores (448) on the Tesla card are the same as a Quadro 6000, the memory bandwidth is the same @ 144 GB/s. Therefore it is to be expected that a C2075 card will not perform any better than a single Quadro 6000 or a single GTX 470 for that matter.
Both cores and memory bandwidth are far less than a GTX 680.
What do you prefer, a € 6200 solution or a € 550 solution with better performance than Maximus. Only for bragging rights?
Scrubbing smoothness is mainly dependent on disk I/O, CPU and to a lesser extent on memory. If your system already has two raid arrays, capable of sustained transfer rates of 1 GB/s+ each, 6+ cores with 15+ MB L3 cache running @ 4.x GHz and at least 64 GB RAM, you will have smooth scrubbing.
Are you familiar with the way Premiere Pro CS5.5.2 / CS6 utilizes RAM?
What data/operation do they copy into RAM and when is this done?
No. I can make guesses, but that does not help. Let me show you why I consider Maximus a marketing hype. In the Benchmark Results there are at least two systems in the Maximus configuration, one using a Quadro 4000 + Tesla C2075 configuration, 'BasicDiskConf2075' currently at rank #83 and the other using a Quadro 2000 + Tesla C2075 configuration, 'Studio i7 Q2000D TC' currently at rank #108. That is not very promising I think. Even my old GTX 480 does better in the MPE On results.
I don't see them listed as having Maximus. Where do I look?
You don't see them listed, because I limited the length of the field in our SQL database and it does not show up. However I manually checked each submission form and these are the two entries we currently have with a Maximus configuration. In a somewhat hidden way you can derive that from the Computer ID used.
I looked both records up and added the video configuration in my earlier post for your information..