Look for V-Sync in your graphics settings and enable that. 30 FPS can't really be called a smooth experience, unless you work for Ubisoft and believe in "cinematic experiences".
The P8H67 is indeed an ATX board, however, when i looked up your system (Asus CG-8350), i found a system with an m-ATX case.
Could you maybe take a few pictures so we can be certain?