3D mark 11 performance preset (GTX 670) normal?

That is on the high side for that setup. You can tell by the bar graph, which shows similar systems and where they score. Almost all fit into two categories, and yours is the higher one. That is why that is there, so you know that you are doing well.

Your graphics score is quite high. The only reason you might not like the CPU score, is it is a quad core and has no hyperthreading, which 3dmark11 likes.