Hi, I have a MacPro5,1 with 2 6-core 2.93 GHz i7, 24GB of RAM, and 1 Radeon 5770. I am processing large 2D images in Photoshop CS5 and I am basically limited by processing speed. Adobe claims that CS6 can make better use of GPU. This makes me wonder whether upgrading to CS6 will make significant change. Furthermore, I also wonder how much CS6's performance will be scaled with video card. For example, If I upgrade the 5770 card to 5870, will I feel it? How about Quadro 4000? Will I feel a difference? Can CS6 make use of multiple video cards? For example, if I add a second 5770 instead of upgrading the current 5770 to 5870, will it make a difference? Any insight on these is appreciated.