Fits fine, with few installation process pointers.
Notes:
- Covers up the first RAM slot (slot 0, the one you usually never change ram to anyway). But install RAM (to slot nearest to CPU) before Ninja.
Might cause problems if using RAM with huge cooling systems on them, ones that them much "higher" than standard size RAM sticks.
- Install the optional chipset fan before Ninja (and graphics card) if you're going to use it. It is possible afterwards, but you'll have very little room to operate, and it has tiny screws.
- IF you're using NZXT Zero case with four sidepanel fans, you might want to consider not installing Ninja's fan. You most likely will not need it. If you do want it however, make sure the attaching metal "wires" and the fan itself do not touch memory modules OR case's sidepanel fans (very little room).