Hi, Ive read a lot of threads about the compatability of the ATI 5770 in 2009 Mac Pros so i know it will work. But I can't find anyone who has upgraded from the stock GT120 to the ATI5770. I do most my work on Photoshop and Lightroom and i'm also getting more into Maya and i'm experiencing quite a bit of lagging in Maya and while playing back some HD animation. Whould i notice a big performance gain in spending £200 on the 5770? I would have to buy it from Apple as i dont have access to windows to flash one from somewhere else.