Differences between Quadro 4000 & ATI 5770 in Premiere CS6?

I'd like to know specifically what kind of performance boost I would see when upgrading to a Quadro 4000 from a ATI 5770 (when using Adobe Premiere CS6.)

My current system is:

- MacPro 2 X 2.26 GHz Quad-Core Intel Xeon
- 16GB RAM
- OSX 10.7.4
- ATI Radeon HD 5770
- Red Rocket
I usually house the media on a G-Raid via esata.

I use Sapphire, Tiffen GFx and Twixtor quite a bit. I'd like to be able to experiement with these plugins without having to render or wait. Is this possible?


I'm having a difficult time getting a clear answer on specifically what effects and functionality would be improved as a result of this upgrade.
As far as I understand it, the Mercury Playback Engine is only utilized when a card like the Quadro 4000 is used... although I have also heard that CS6 will take advantage of other graphics cards (such as the ATI 5770) via open CL (or is it GL)?
There are only a handful of cards that are listed as being supported on the Adobe site (Quadro 4000 is one of them... and the ATI 5770) is not.

Can anyone kindly shed some light on this subject ?
Thanks in advance.


Michael