I currently have 32, but for the most part, that's overkill. I tend to run Maya, unreal 4, zBrush and photoshop at the same time, which I did when I had at 16 with not very much lag until I added Unreal to the mix. (I really hate closing down programs and waiting for them to open!). At min, you'd want 8, at 16 if you want…