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At the back we can get a good overall look at some features you'll not find on regular cases. In the top left and right the square buttons can be used to unlock the side panels. Then meshes everywhere. Below them you'll notice a 140mm AF140L exhaust fan that comes factory installed. You'll notice that the Obsidian 900D has 10 expansion slots for maximum multi-GPU compatibility, this will allow you to go for two, three and four way SLI / CrossfireX configurations, all standard ATX and Micro-ATX, Mini-ITX board types obviously fit fine as well as Extended ATX and even HPTX form factor motherboards. That's EVGA SR2 motherboards etc with two processors on one motherboard PCB.
At the bottom we see space for not one but two power supplies, it looks a little weird but rotating them sideways you indeed can mount very powerful kilowatt PSUs. Some Extended ATX and even HPTX form factor motherboards indeed can make use of two power supplies.
Back to the top side again, the top side cover is a huge mesh that is all about ventilation alright. We'll look at it in more detail later on this page though. Right now focus on the top 5.25" bay. That in fact is a door. See the five grey dots?
Click on it and it opens up. You'll notice that in the top middle an extended plastic bar eh? That is your power button with HDD LED activity, below it a reset button. Then to the left 3.5mm headphone and microphone jacks, in blue two USB 3.0 ports and to the right 4x USB 2.0 ports.
Moving back to the top we can see that we can easily remove the top mesh alongside a dust filter. Quite important as it allows us access to a plethora of fan mounts. Which on its end can be used to create extra airflow.
Obviously you could also make one kick-ass liquid cooling solution here and mount a nice phat radiator. There actually are 4 x 120 / 140mm top fan mounts.
From up top we move to the bottom, the chassis rests on four rubber feet to prevent it from resonating. The chassis is very heavy, there's just no way it would resonate whatsoever.
