Obviously the whole point of a 5K display is to create incredibly sharp images. But does the CPU and/or GPU also effect the clarity of what you see or do they only determine speed? It's kind of a dumb question....but I've never totally understood it. I think conventional wisdom says they don't impact sharpness but I suspect that may not be true. I had a 21.5 inch iMac with a 1920x1080 screen. I thought it looked pretty fuzzy/blurry. I have a desktop tower PC with a Dell 23 inch 1080 monitor--lower ppi than the Mac--yet it looks sharper to me. It also has an i7 4770K CPU and a GTX graphics card--650 I think? I'm thinking that must be the difference.