I bought a 2013 27" iMac i7 3.5ghz / 8gb ram / 780m a couple days ago and I'm a little surprised by how poorly photoshop is handling my design files. I made a video showing how choppy moving my comp around the screen is. http://youtu.be/w8XgjJ1vI4k Now obviously I'm not moving it around this much all the time but I do move it often in addition to moving elements of the design naturally. In all cases it is a bit jerky/choppy. If this is normal for a 4gb video card then I wonder if I'm just overly sensitive about the performance and this is fine to most people. I would figure a 4gb video card would have this moving around pretty smoothly. Thoughts from those who use Photoshop for web/graphic design?