It doesnt matter if your computer can handle rendering a million pollies. Hell, ZBrush can render billions of pollies on the newest machines out today because of it's really good culling system.
Its the fact that once you take that million polly model, throw it into a game with a bunch of other million polly models moving around, checking for collisions poly-by-poly, doing hundreds of mathematical calculations in the background, not to mention receiving and processing user input, displaying 2D graphics, applying shaders, AI, physics, and everything else that goes into making a game nowadays, your FPS will be borderline negative (meaning 0).
TDK managed to model that in roughly 500 polygons, and he probably wasn't even trying. Looking at that pic Id imagine its possible to be done in under 200 and still look just as good.
Just pointing that out.