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So the thumbscrews are used to open up the side panels. Then a top mesh, with below it you'll notice a 140mm AF140L exhaust fan that comes factory installed. You'll notice that the Obsidian 750D has 9 expansion slots for maximum multi-GPU compatibility, this will allow you to go for two or three SLI / CrossfireX configurations, all standard ATX and Micro-ATX, Mini-ITX board types obviously fit fine as well as Extended ATX, not HPTX form factor motherboards though. At the bottom we see space for one power supply.

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. 

Front panel IO - As you'll notice, in the top middle is an extended plastic bar. That is your power button with HDD LED activity, to the left a reset button and 3.5mm headphone and microphone jacks, in blue two USB 3.0 ports and to the right 2x 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. You could install 120/140/240/280 and 360mm fans / radiators.

From up top we move to the bottom, the chassis rests on four rubber feet to prevent it from resonating. The chassis is quite heavy, there's just no way it would resonate whatsoever. To the left we see a removable dust filter. To the right you can spot a mesh, at the other side the drive cages are located but sure you can install two fans there. There's no dust filter here though.