I was concerned because Photoshop CS4(v 11.0.1) limits me to opening 4 images when I check Enable Open GL Drawing in preferences. By unchecking it, I can open a large number of images at the same time. I don't yet know much about Open CL. It was the GL that prompted me to ask about the card.
Mac Pro dual Quad-Core Intel Xeons Early 2008; 16GB RAM; MacOS X 10.11.6, iOS 9.3.5
