Because it can make things like this. I can actually max out settings in Apophysis. The old one was incapable, and the next step down resulted in very, very long renders. Of course, I couldn't do anything else while it was rendering. But with the new computer, I'm rendering as I'm typing! No lag! No churning noises coming from the CPU! Woohoo!
Oh, and I have no idea what to call this. It is, however, a new favorite. I really, really like the way this came out.