Mostly about effectivity vs. efficiency in terms of game programming.
The PC works great. Quiet and efficient. I can every game I have laying around on max settings and ~50 fps. That's great! I think about splitting some of my engine features into seperate threads, so that I can make use of multiple processors. However, I'm not experienced when it comes to multi-processors programming. But I have so many CPU-consuming ideas - I will probably be able to cope with whatever I need for making it real.