Hi all, I have a new 27inch base model iMac that comes with 4GB ram and a 4670 256mb Radeon graphics card. I noticed that when I copy/paste images in photoshop cs4 and drag the images, the pasted image usually gets blocky and moves in slow motion when i drag it. My friend has a Mac with a 512mb video card and 4gb of ram and has no such issue. I'm wondering if the difference in VRAm is what is causing my sluggishness in Cs4 My question is: should I have opted for the 512 model graphics card? I have another week or so to return my iMac. Or is this a RAm issue, and should I upgrade to 8gb of ram? I guess I'm wondering how much of a difference video memory makes on system performance. Thanks!!